Red hair tips electric eel in fast and slow motion: translating from P5.JS processing to Wolfram

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Open in Wolfram Cloud ↗

DOWNLOAD-DESKTOP-NOTEBOOK.nb (333 KB)

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A shorter version of code for interactive app part:

ClearAll["`*"];
x = Range[0., 9999];
k = 4 Cos[x/21];
e = x/1880 - 20;
d = Sqrt[k^2 + e^2];
m = UnitStep[k^2 - 15];

Manipulate[
 With[{q = 3 Sin[2 k] + .3/k + k Sin[x/4465] (9 + 2 Sin[14 e - 3 d + 2 t])},
  Graphics[
   ({Blend[{White, Red}, Sin[t]^2], Opacity[.5], PointSize[.01],
      Point@Pick[#, m, 1],
      White, Opacity[.75], PointSize[.0025],
      Point@Pick[#, m, 0]} &)@
    Transpose@{q + 50 Cos[d - t] + 200, 875 - q Sin[d - t] - 39 d},
   PlotRange -> {{100, 300}, {75, 320}},
   Background -> Black,
   ImageSize -> 550]],
 {t, 0, 2 Pi, Appearance -> "Labeled"},
 SaveDefinitions -> True]
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_ezgif-6f71cfb116f50045.gif

Here is a simple time-reversal of animation - and it looks very different. So called Perceived Causality is remarkable. Forward motion reads as self-propelled body: contraction, release, internal drive. Reverse or inverted motion can read as externally driven deformation: fronds dragged by flow, seaweed bending in current, filtration fans opening and closing. That shifts perception from fauna to flora-like structure because plants/seaweed usually read as passive material responding to environment, while animals read as active bodies producing motion. See Michotte’s work:

Redirecting

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Very cool, Vitaliy. Making art with the Wolfram Language (here, I know, transcoded from JavaScript) is such an underexplored realm.

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