OBSERVATION 007
海牛
Umiushi — Sea slug
Press the picture or the button to reduce the points.40,000 → 625 → 40 → 1, then back to 40,000.
At fewer points, dots grow and trails linger to help you follow their paths.
“Listen” maps the displayed points to sound.Changing the count rebuilds the sound.
The hairs along the rim sway, each one later than the last.
The body itself changes its posture as it goes.
A wave is not being sent through a fixed shape.
The way the body bends is different every time.
So the same figure never appears twice — until it comes round.
The hairs do not stand straight out.
They curve back a little.
Straight, they read as bristles. Curved, they read as soft.
Read and verify the equation
(i, t,
b = i < 17000, j = i - 17000, k = j % 80, e = k % 2 ? 1 : -1,
u = (j / 80 | 0) / 288,
s = b ? i * .618034 % 1 : .05 + .9 * ((k / 2 | 0) / 40),
c = (i * .754878 % 1) * PI,
p = -1.45 + 2.9 * s + .5 * sin(t - s * 3),
g = 2.9 - 1.5 * cos(t - s * 3),
cx = 200 + 126 * sin(p), cy = 238 - 120 * cos(p) + 22 * sin(s * 2 - t),
qx = 126 * cos(p) * g, qy = 120 * sin(p) * g + 44 * cos(s * 2 - t),
m = hypot(qx, qy), nx = -qy / m, ny = qx / m, hx = qx / m, hy = qy / m,
W = 39 * sin(PI * s ** .7) ** .55,
w = .55 * sin(t * 2 - s * 4 + k * .3),
dx = nx * cos(w) - ny * sin(w), dy = nx * sin(w) + ny * cos(w),
L = 70 * u * (1 - .28 * u) * sin(PI * s ** .8) ** .35,
Q = b
? [cx + W * cos(c) * nx, cy + W * cos(c) * ny - W * sin(c) * .38]
: [cx + e * (W * .8 + L) * dx - 20 * u * u * hx,
cy + e * (W * .8 + L) * dy - 20 * u * u * hy],
Dx = 200 + 46 * sin(t + 3.32) + 22 * sin(t * 2 + 5.64),
Dy = 200 + 50 * cos(t + 4.32) + 16 * sin(t * 3 + 3.32)
) => [Dx + (Q[0] - 200) * .68, Dy + (Q[1] - 200) * .68]
Fingerprint of this equation
sha256:e485d1b6b18fe4368f9318536b3d5ccba90f87e50c966794aac4d15f92354162
The same point number and time give the same coordinates.
Trails and the appearance of points depend on rendering settings and the device.
The button above takes the equation out as it is. To count it again yourself:
pbpaste > f.txt && printf %s "$(cat f.txt)" | shasum -a 256
Take it and run it.What appears when you change the equation? Run and rewrite this equation →