goxpyriment

Lilac Chaser (goxpyriment)

This example implements the Lilac Chaser illusion: a ring of lilac disks with one disappearing wedge, creating the perception of a rotating gap and a green afterimage.

Usage

From the repository root:

cd examples/lilac_chaser
go run . -d

Flags

• -d
  Developer mode (windowed 800×800 instead of exclusive fullscreen).

• -r float
  Radius of the lilac disks in pixels.
  Default: 40.

• -R int, -G int, -B int
  RGB components of the disk color (0–255 each).
  Defaults: R=250, G=217, B=248 (a typical lilac color).

Example:

go run . -d -r 50 -R 255 -G 180 -B 220

Behavior

• White background (control.White).
• 12 disks arranged on a circle of fixed radius.
• On each frame:
  • All disks except one are drawn, creating a moving “gap”.
  • A central fixation cross is shown; you should keep your gaze on it to see the illusion.
• Frames advance every ~100 ms using clock.Wait(100).
• Press ESC or close the window to quit.

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