Things that push things

Weight, size and where it's hit decide whether a mug goes over

Roll a football at a full mug and the mug goes over, spilling the way the ball was rolling. Roll a marble at it, even fast, and the mug only rattles. There's no line in the code that says "football tips mug". There is one rule for anything standing on its foot, and every ball brings its own weight, bounciness and size to it.

The rule asks one question. Does the blow swing the mug round its far edge hard enough to lift its middle over that edge? A heavier ball gives a harder blow. A bigger ball hits higher up, where the same blow turns the mug more. A taller, narrower thing goes over more easily, and a wider, squatter one resists. In the released game every cup stands by this sum. next update Bottles and flasks stand by it too, each with its own numbers.

Drag a mug with your finger and stop dead, and it goes over. Slow down gently and it stays up. Swing it round a sharp corner too fast and it goes over as well. The mug wants to keep going while your finger has stopped or turned, and the same sum decides both. Nothing in the code knows about corners. Push a mug slowly, even at its rim, and it slides instead, because the paper's grip gives way before the mug's foot does.

Fruit, pens, pebbles and stamped cards are different again. They are painted straight into the same grid of squares as the paint. When you push one, the game reads all the squares of that fruit as one solid piece, moves it, and lays it down again from its original shape, so it never crumbles or loses a drop. Shove a pen at one end and it swings round, because the game measures how its weight is spread from its own squares.

Side view of a ball rolling at a full mug, which tips over or rattles by the game's rule — Try it: roll a ball at a full mug The game's own rule
A side view. The ball rolls in at the speed you set and meets the mug with the game's bump and tipping rule, using each ball's mass, bounciness and size from the game. **What to look for:** the football tips the mug at 160 cells/s, as in the game's test. Switch to the tennis ball or the marble at the same speed and the mug only rattles. Then find the slowest speed that still tips it. The demo shows the rattle as a short shove.

How fast each ball must roll to tip a full mugAn automated test checks the football at 160 (tips) and the tennis ball and marble (rattle).

A football must roll at 98 cells/s, a beach ball 220, a tennis ball 1,061, a bouncy ball 3,905 and a marble 23,402.

Data table

How fast each ball must roll to tip a full mug
the ball rolled at the mug	speed needed
Football	97.5
Beach ball	219.5
Tennis ball	1061.3
Bouncy ball	3905.4
Marble	23 402.4

Source: Worked out from the game's own tipping rule and each ball's mass, size and bounciness; a ball hits the mug at the height of its centre.

One tap bursts a yolk, pops a bubble and sends a fly darting, because a dozen systems feel the same touch

When a hand, a hammer, a rolling pin, a rolling ball, a toy car's wheels or a monster truck's tyre touches the page, it describes a press: how big its foot is, how hard it presses, how hard its face is, how sharp, how fast and how heavy. Then the game hands that one description to a dozen systems in turn. The paint and paper underneath, flames, soap bubbles, foam, confetti, creatures, loose things, plants, sticks and mould all read the same press and decide for themselves.

So one tap can burst a yolk, pop a bubble, send a fly darting off and slide a cup. Whether something breaks goes by its own strength. A yolk gives way to almost anything, then a strawberry, a tomato and an orange, and an apple holds out longest. A rolling football presses hard enough to burst a strawberry, and a marble rolls over it. A rolling pin slammed down lands between the orange and the apple, so it bursts the orange and leaves the apple whole.

Hardness matters too. What breaks by a blow feels it through a soft face much less than through a hard one. What tips takes all of it. That's why a palm swept slowly past a toothpick leans it over instead of snapping it, and a palm flicked at a mug knocks the mug flat. A hammer brought down on a toothpick drives it into the paper without breaking it, because the hard face holds its top straight.

The press also reaches the creatures. They feel it as danger: a small one is slid clear, and the others dodge. No creature is ever hurt, by design, and that rule runs through the same channel as everything else.

One press, read twelve times

paper and paint

flames under it

soap bubbles

foam

confetti and bits

creatures

sealed vessels

loose things

plants

balls in the air

sticks

mould

One press, read twelve times. The order is fixed. Each listener reads the same description (foot · how hard · how firm · how sharp · how heavy · how fast · slip · warmth · plough) and decides by its own numbers.

What gives way to what
On one log scale	Gives way at	Presses at
0.3	yolk	toy car wheel
0.4	·	marble rolling
0.8	strawberry	·
1	·	football rolling
1.5	tomato	·
2	banana	·
2.5	·	rolling pin
3	passion fruit	·
4	orange	·
5.05	·	rolling pin slammed
6	apple	·
22	·	hammer blow
50	·	monster-truck lug

What gives way to what. How much each thing can take before it bursts, and how hard each thing presses, on one scale. A press bursts whatever sits below it in the gives-way column.

Tilt the tablet and balls, cars, fruit, string and cups feel the same downhill

Tip a phone or tablet and the page tips with it. Balls, toy cars, fruit, string, cups, confetti and stickers all read the same downhill pull. Each one only starts moving when that pull beats its own grip on the paper. A marble goes almost at once. Confetti needs a clear tip. String and a mug need a steep one. A sticker stuck down on dry paper never slides at all, until heat or water has loosened its glue.

A marble and a tennis ball tipped together don't speed up alike. The marble is solid, the tennis ball hollow, and a rolling ball keeps some of its energy in its spin. The game uses the same two fractions you'd find in a physics book, 5/7 and 3/5, so the marble pulls ahead.

The tablet also learns how you hold it. Rest it at an angle in your lap and your drawing doesn't drain to the bottom. A small tip is soon treated as the new level. A clear tip keeps things pouring, and fades only slowly. Water, goop and the air read the same downhill through their own flows.

The shake button bumps the table: a quick run of short jolts in random directions. Loose things lag behind each jolt, so they jump about, each by its own grip.

Six loose things on a tipped page, each starting to slide or roll at its own angle — Try it: tip the page The game's own rule
Six loose things on the same tipped page, downhill to the right. Each reads the game's downhill rule with its own grip. The balls speed up by 5/7 and 3/5 of it, the car's speed drifts back towards stopped as a let-go car's does, and the mug creeps as it does in the released game. Things are drawn bigger than their size. **What to look for:** raise the tilt slowly and watch each one start at its own angle. Press "Shake the table" at a low tilt and see the light things jump.

A held tip slowly becomes the new levelAn automated test checks that a clear tip keeps things moving for seconds.

A 0.1 g tip fades below a marble’s start (0.04 g) within a second; a 0.3 g tip takes about 29 s and a 0.5 g tip about 44 s.

tipped 0.1 g (about 6°)
tipped 0.3 g (about 17°)
tipped 0.5 g (30°)
a marble starts rolling

Data table

A held tip slowly becomes the new level
seconds held	tipped 0.1 g (about 6°)	tipped 0.3 g (about 17°)	tipped 0.5 g (30°)	a marble starts rolling
0	0.07	0.27	0.47	0.04
0.5	0.0479	0.265	0.4617
1	0.0307	0.2602	0.4536
1.5	0.0172	0.2554	0.4456
2	0.0068	0.2507	0.4378
2.5	0	0.246	0.43
3	0	0.2415	0.4224
3.5	0	0.237	0.4149
4	0	0.2326	0.4076
4.5	0	0.2282	0.4004
5	0	0.2239	0.3932
5.5	0	0.2197	0.3862
6	0	0.2156	0.3794
6.5	0	0.2116	0.3726
7	0	0.2076	0.3659
7.5	0	0.2036	0.3594
8	0	0.1998	0.353
8.5	0	0.196	0.3466
9	0	0.1922	0.3404
9.5	0	0.1886	0.3343
10	0	0.185	0.3283
10.5	0	0.1814	0.3223
11	0	0.1779	0.3165
11.5	0	0.1745	0.3108
12	0	0.1711	0.3052
12.5	0	0.1678	0.2996
13	0	0.1645	0.2942
13.5	0	0.1613	0.2888
14	0	0.1581	0.2835
14.5	0	0.155	0.2784
15	0	0.152	0.2733
15.5	0	0.149	0.2683
16	0	0.146	0.2633
16.5	0	0.1431	0.2585
17	0	0.1402	0.2537
17.5	0	0.1374	0.249
18	0	0.1346	0.2444
18.5	0	0.1319	0.2399
19	0	0.1292	0.2354
19.5	0	0.1266	0.231
20	0	0.124	0.2267
20.5	0	0.1215	0.2225
21	0	0.119	0.2183
21.5	0	0.1165	0.2142
22	0	0.1141	0.2102
22.5	0	0.1117	0.2062
23	0	0.1094	0.2023
23.5	0	0.1071	0.1984
24	0	0.1048	0.1947
24.5	0	0.1026	0.191
25	0	0.1004	0.1873
25.5	0	0.0982	0.1837
26	0	0.0961	0.1802
26.5	0	0.094	0.1767
27	0	0.092	0.1733
27.5	0	0.09	0.1699
28	0	0.0634	0.1666
28.5	0	0.0428	0.1634
29	0	0.0267	0.1602
29.5	0	0.0141	0.157
30	0	0.0044	0.1539
30.5	0	0	0.1509
31	0	0	0.1479
31.5	0	0	0.145
32	0	0	0.1421
32.5	0	0	0.1392
33	0	0	0.1364
33.5	0	0	0.1337
34	0	0	0.131
34.5	0	0	0.1283
35	0	0	0.1257
35.5	0	0	0.1231
36	0	0	0.1206
36.5	0	0	0.1181
37	0	0	0.1157
37.5	0	0	0.1133
38	0	0	0.1109
38.5	0	0	0.1086
39	0	0	0.1063
39.5	0	0	0.104
40	0	0	0.1018
40.5	0	0	0.0996
41	0	0	0.0975
41.5	0	0	0.0954
42	0	0	0.0933
42.5	0	0	0.0913
43	0	0	0.0795
43.5	0	0	0.0553
44	0	0	0.0364
44.5	0	0	0.0217
45	0	0	0.0103
45.5	0	0	0.0014
46	0	0	0
46.5	0	0	0
47	0	0	0
47.5	0	0	0
48	0	0	0
48.5	0	0	0
49	0	0	0
49.5	0	0	0
50	0	0	0	0.04

Source: Computed with the game's own rest-pose rule: it follows a small tip quickly and a clear tip slowly, with a small dead zone.

A ball rolled through paint prints it again one turn later

Each ball is a sphere that turns as it rolls. Its skin is split into 512 small patches, and each patch carries whatever paint it has touched. Roll a ball through a stripe of paint and the patch that touched it comes round to the bottom again after exactly one turn of the ball. There it prints the stripe again, fainter, and again one turn later. Rolling it back and forth only moves the paint about. Paint comes off the paper onto the ball and back, and none is made or lost.

A tennis ball is fuzzy, so it soaks up a lot and prints grainy. A marble takes up little. Paint under a ball slows it down, and wet soapy paper lets it roll much further. Slam a ball down and it squashes for a moment, splats what's under it and bounces off a little sideways, because no hit is quite straight.

Toy cars are steered towards your finger, the way a child steers one, and they can only turn sharply while rolling. Their four tyres carry paint the same way the ball's skin does, so a car driven through ketchup leaves red tracks that fade over a long way. Deep in mud, honey or glue, the wheels sink and crawl through. A car that drives into a tomato bumps it and leaves it whole, because a wheel presses more lightly than a tomato can take.

The monster truck's tyre is a spectacle: nearly two-fifths as long as the page is high. It's simulated as one line of cells where it touches the paper, with chevron lugs that press hard, dent the paper and squeeze paint out sideways.

Moving things push the page back. A ball or a hand dragged through paint ploughs it aside with a bow wave, heavier balls more. Balls, cars and the hand stir the air as they go, so a football rolled fast past a candle blows it out without touching it. A slap on the paper puffs air out that blows nearby confetti. The air is the same coarse stable-fluids grid the fan and hair dryer blow, after ^{Stam 1999}.

A ball seen from above rolling through a red stripe of paint and printing it again one turn later — Try it: roll a ball through paint The game's own rule
Seen from above. The ball turns by the game's quaternion rule, and its 512 skin patches pick up and print paint by the shares in the game's carry rule (one paint, simplified). Drag on the paper to roll it yourself, or press Roll it back. **What to look for:** the faint copies of the red stripe land on the yellow marks, each one turn of the ball apart. The marble's marks are close together, the football's far apart. "Paint in all" never changes: the ball only moves paint about.

A tennis ball's track after rolling through a red stripe: fainter red copies of the stripe repeating at even spacing along its path — **In the game.** A tennis ball rolled through a stripe of red paint prints it again and again, fainter than the stripe, one turn of the ball apart.

The hand touches as much paper as its painting covers, and tells a slap from a smear

The hand is free and always on screen. Turn its size slider all the way down and only the tip of the index finger touches, for fine finger painting. From a little below the middle of the slider up it's the whole palm, which squeezes a palm's worth out of a puddle and ploughs a broad trench through thick paint. With a mouse you see the painted hand, and the disc it presses has the area of the skin in that painting, to within half a percent. An earlier version pressed less than half the skin it showed. That was fixed before the release.

A touch screen can't tell how fast a finger came down. So the hand presses at once and decides afterwards. Lift quickly without sliding and it was a slap, and paint splashes. Slide, or stay, and it was put down, so smearing paint never sprays it. Even the painted cuff of the sleeve is part of the simulation. It shoves aside a cup the palm missed, and lifts over it when you tip onto a fingertip.

Every finger on the glass is its own hand. One can hold a piece of string while another smears paint, and lifting one never drops what the other holds. If the system steals a finger mid-gesture, say for a notification, the hand lets go cleanly and finishes nothing.

Throws read the finger's real speed. Each touch event carries the time it happened, so a fling is measured the same on a busy old tablet as on a fast one. A thrown thing leaves at a share of the finger's speed, and a solid one skids to a stop on landing.

The hand's reach now follows its paintingAt the default size the earlier hand pressed less than half the skin it showed; now the palm disc has the painted skin's area to within half a percent, pinned by a test. At small sizes the touch moves from the index fingertip to the palm, so it is smaller on purpose.

At the default size (0.4) the hand now touches a radius of 10.1 cells, where the earlier rule touched 6.6; at full size 22 against 18.2.

now: a disc with the painted skin's area
earlier: a rule of its own

Data table

The hand's reach now follows its painting
size slider	now: a disc with the painted skin's area	earlier: a rule of its own
0	1.65	2.1
0.02	1.711	2.167
0.04	1.887	2.278
0.06	2.165	2.414
0.08	2.531	2.569
0.1	2.973	2.741
0.12	3.48	2.927
0.14	4.036	3.127
0.16	4.631	3.338
0.18	5.252	3.56
0.2	5.885	3.791
0.22	6.518	4.033
0.24	7.139	4.283
0.26	7.734	4.542
0.28	8.29	4.809
0.3	8.797	5.084
0.32	9.239	5.366
0.34	9.605	5.655
0.36	9.883	5.952
0.38	10.059	6.255
0.4	10.12	6.564
0.42	10.402	6.879
0.44	10.724	7.201
0.46	11.064	7.529
0.48	11.415	7.862
0.5	11.775	8.201
0.52	12.143	8.545
0.54	12.517	8.895
0.56	12.896	9.25
0.58	13.28	9.61
0.6	13.668	9.975
0.62	14.06	10.345
0.64	14.456	10.719
0.66	14.855	11.099
0.68	15.257	11.483
0.7	15.662	11.872
0.72	16.07	12.265
0.74	16.48	12.662
0.76	16.893	13.064
0.78	17.308	13.47
0.8	17.725	13.88
0.82	18.145	14.295
0.84	18.566	14.713
0.86	18.989	15.135
0.88	19.414	15.562
0.9	19.841	15.992
0.92	20.27	16.426
0.94	20.7	16.864
0.96	21.132	17.306
0.98	21.565	17.751
1	22	18.2

Source: From the game's hand-size rule and the rule it replaced.

Strings stretch out of melted cheese, thin and snap

Press the hand into melted cheese, honey or glue and pull away, and strings stretch off your fingers. As you pull, each string thins and draws a little more out of the goop where it's stuck. When it's too thin it snaps somewhere along its length. By the code, the part near the paper falls back as a thread and the rest drops in a blob under your hand, and every drop is accounted for. On the page a child sees the strings stretch and snap; the fallen threads don't show.

How stringy something is depends on its state, not its name. Cold cheese doesn't string at all. Melt it and it strings as much as anything in the game. Honey and glue string a bit, peanut butter and chocolate hardly. Dust dough with flour and the hand hardly sticks to it, through the same rule that every pick-up reads.

The String tool is a different thing: a length of string you lay on the paper. It's a chain of points that can't stretch. The paper's friction is so heavy that it slides and doesn't swing. Drag one end and the rest follows, wrapping round cups in its way, picking up wet paint and printing it further on. Tilt the page past its grip and it slides downhill like the balls and cups.

One small fix shows the approach. Strings used to be drawn out of the single square under their anchor, and every string pulled out of thick peanut butter left a tiny pit. A hand stroke came out dotted with pinpricks. Now a string draws from a little foot around its anchor, more from nearby and deeper squares, as the goop would flow in towards it. The pinpricks are gone, and the total amount of goop over a stroke changes by less than a millionth.

A hand pulling strings out of a pool of melted goop; they thin, snap and fall as threads — Try it: pull strings out of goop The game's own rule
The circle is the hand at its default size. It comes down in a pool of goop and pulls away, catching, stretching, topping up and snapping strings by the game's rule. Drag on the paper to pull with your own hand, or press Pull again. **What to look for:** melted cheese stretches all the way across, honey snaps late, peanut butter and chocolate snap early and lie as threads (in the game the fallen threads don't show on the paper). Slide "melted" well down and nothing strings at all. The rule counts moves, not seconds: it tops a string up once per move, so pull in smaller steps and even honey holds on.

Strings of warmed cheese stretching from a slice all the way to the hand pulling away from it — **In the game.** A cheese slice warmed with the hair dryer, then pulled by the hand: strings stretch from the slice all the way to the hand.

A mug fizzes and a bottle sprays because of the size of its mouth

Cups, the cola bottle and the flask are all one kind of thing: a container with contents. What's inside is a well-mixed amount with its colour, what it's made of, its fizz and its temperature. Its opening is a door, and anything that lands there goes in, the way it lands anywhere else.

There's no geyser code and no toothpaste code. When gas forms inside, it has to leave through the opening. Through a wide mug the gas leaves slowly and the drink just fizzes and froths over the rim. Through the narrow neck of a bottle the same gas has to rush out fast, and above a set speed it throws the liquid up with it. Soap in the mix traps the gas as foam that lasts far longer. Change the numbers and you have a different eruption.

Knock a mug over and it spills the way it fell. In the released game the spill is a shortcut: a puddle and a splash. next update Bottles and flasks stand and fall by their own build. A full cola bottle on a narrow foot goes over on a tilt before it slides, and a squat flask slides. Empty the bottle and it weighs less than half as much, so it tips at a knock a full one only rattles at. What pours out is set by geometry: a mug empties almost at once, a bottle pours for seconds, and what's below the neck stays inside.

A cola bottle tips at an angle that moves with how full it isIt tips when the slope beats its foot over the height of its centre of mass, and slides when the slope beats its grip. A test pins the full bottle tipping and the flask sliding. The stretch above the dashed line, about 20 to 65 % full, is the rule's prediction, by a degree at most; no test pins it.

Full or empty, the bottle tips at 18.8°, and up to 22.9° at 40 % full; it slides at 21.8°, so from about 20 to 65 % full it would slide first.

cola bottle tips at
it slides at

Data table

A cola bottle tips at an angle that moves with how full it is
how full (%)	cola bottle tips at	it slides at
0	18.753	21.801
2.5	19.27
5	19.756
7.5	20.209
10	20.626
12.5	21.009
15	21.355
17.5	21.666
20	21.94
22.5	22.178
25	22.381
27.5	22.55
30	22.685
32.5	22.789
35	22.861
37.5	22.904
40	22.919
42.5	22.908
45	22.872
47.5	22.812
50	22.732
52.5	22.632
55	22.513
57.5	22.378
60	22.228
62.5	22.064
65	21.888
67.5	21.701
70	21.505
72.5	21.3
75	21.087
77.5	20.868
80	20.644
82.5	20.416
85	20.184
87.5	19.948
90	19.711
92.5	19.472
95	19.233
97.5	18.993
100	18.753	21.801

Source: next update Computed from the game's own balance rule for a part-full bottle.

A football rolled past a candle blows it out, and a toy car driven through ketchup leaves red tracks

Each of these happens because two systems share a layer of the page, and neither one names the other.

Shared: the ball's wake → air speed at the flame

Roll a football fast past a lit candle

The candle blows out without being touched. Rolled slowly, it stays lit. Pinned by a test · Air that really moves

Shared: a slap → a puff of air

Slap the paper beside some confetti

The gust from the slap blows the confetti away. Pinned by a test · Air that really moves

Shared: paint carried on its tyres

Drive the toy car through ketchup

Red tyre tracks run on beyond the ketchup, fading as the tyres give up what they took. Pinned by a test · Runny, sticky and oily

Shared: the page's heat → each toy's material

Bake a toy car and a beach ball in the oven

The car slumps into a puddle of its own plastic. The ball shrivels into a patch with just the plastic of its skin, stripes and all. The marble comes through. Pinned by a test · Heat and fire

Shared: how set each square of goop is

Melt cheese with the hair dryer, then pull it with the hand

Strings stretch out of it. Let it cool and set, and it won't string. Pinned by a test · Heat and fire

Shared: the press → danger

Sweep the hand across the paper where creatures are

Each one gets out of the way, slow or fast, fingertip or palm. None is ever under the hand. Pinned by a test · Animals with their own minds

98 cells/s

The slowest a football can roll and still tip a full mug. A marble would need 23,402.

12

Systems that read every press, in a fixed order, each by its own numbers.

512

Patches on every ball's skin, each carrying its own paint round.

8×

How much slower than life things fly on the page, the same for everything that falls.

35

Kinds of loose thing one test sweeps the hand through, each with a written sentence of what should happen.

60 Hz

Fixed steps a second for every bump, roll and tip, worked out in a Web Worker beside the drawing.

A mug lying on its side after a football rolled into it, the ball just behind it, a ring stain where the mug stood and the drink spilled ahead in the direction the ball was rolling — **In the game.** A football rolled at a full mug: the mug goes over and the drink spills the way the ball was rolling. The ring is where the mug stood.

A toy car beyond a line of ketchup, with red tread prints fading along its track — **In the game.** A toy car driven through a line of ketchup leaves red tread prints that fade along its track.

Nothing stacks and everything falls in slow motion, so the page stays steady under a child's hands

A tablet has to run all of this at 60 steps a second next to water, paint, fire and air. Each shortcut below keeps what a child sees and drops what they wouldn't.

In real life. Solid things turn about any axis, lean on each other and stack

In the game. A 2.5D capsule with a height. It spins only about the vertical, and a standing thing rocks about one edge with one angle

Why that's enough. Fast and steady with a child's hands all over it. Nothing stacks, and that's the price

In real life. Contacts are solved together, many times over

In the game. One impulse per pair per step, overlap pushed apart in mass share

Why that's enough. Plenty for the handful of things on a page, with no jitter to manage. Piles and chains of contact are lost

In real life. g = 9.81 m/s²

In the game. One gravity for everything, much weaker than real g at the page's scale

Why that's enough. A satisfying arc at this page size. Flight is in slow motion, about 8 times, and the same for all, so things dropped together land together

In real life. A football is 22 cm across

In the game. Shrunk to fit the page, a football to about 2 cm across. Masses are the real ones

Why that's enough. Toys must fit a page and be seen. Anything that depends on size and mass together, such as wind on a ball, isn't real

In real life. Friction depends on both surfaces

In the game. One grip per kind of thing; a few friction laws side by side

Why that's enough. Readable and tunable. Paint under a sliding lid doesn't change its grip; only balls roll further on soap

In real life. Things float on water

In the game. No buoyancy for solid things. Paint and water slow them by drag and stickiness

Why that's enough. The page is a height field, not a 3D fluid. Oil floating on water is handled as a layer, in Runny, sticky and oily

In real life. A toy car's tyres grip and skid

In the game. Steered towards the finger; the monster truck drives at a constant speed that nothing slows

Why that's enough. A child steers, and the truck is a spectacle. No drifting, and the truck can't get stuck

In real life. A palm has five fingers and gaps

In the game. A lumpy disc with the painted skin's area; strings are a segment with a volume and a snap threshold

Why that's enough. One radius drives every channel and matches what you see. A palm print is a blob, and strings don't sag or bead

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A football topples a mug, a marble doesn't, and no rule says so

Weight, size and where it's hit decide whether a mug goes over

One tap bursts a yolk, pops a bubble and sends a fly darting, because a dozen systems feel the same touch

One press, read twelve times

paper and paint

flames under it

soap bubbles

foam

confetti and bits

creatures

sealed vessels

loose things

plants

balls in the air

sticks

mould

Tilt the tablet and balls, cars, fruit, string and cups feel the same downhill

A ball rolled through paint prints it again one turn later

The hand touches as much paper as its painting covers, and tells a slap from a smear

Strings stretch out of melted cheese, thin and snap

A mug fizzes and a bottle sprays because of the size of its mouth

A football rolled past a candle blows it out, and a toy car driven through ketchup leaves red tracks

Roll a football fast past a lit candle

Slap the paper beside some confetti

Drive the toy car through ketchup

Bake a toy car and a beach ball in the oven

Melt cheese with the hair dryer, then pull it with the hand

Sweep the hand across the paper where creatures are

Nothing stacks and everything falls in slow motion, so the page stays steady under a child's hands