goxpyriment

Kanizsa Illusory Square (goxpyriment)

This example reproduces the classic Kanizsa square illusion: four “pacman” disks on a uniform background with a central square mask that induces the perception of an illusory contour.

Usage

From the repository root:

cd examples/kanizsa-square
go run . -d

Flags

• -d
  Developer mode (windowed 800×600 instead of exclusive fullscreen).

• -s int
  Subject ID (not used for data here; kept for API consistency).

• -r float
  Radius of the inducing circles in pixels.
  Default: 50.

• -w float
  Size (width and height) of the central square in pixels.
  Default: 200.

Example:

go run . -d -r 60 -w 250

Behavior

• Light gray background (set via control.NewExperiment).
• Four black circles arranged at the corners of an invisible square of side w.
• A central light-gray square mask of size w × w.
• A short instruction ("Kanizsa illusory square – press any key to exit") shown below the figure.
• The program waits for a key press and then exits.

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