Three-layer square field loading.

SUPERMEGAEXPERIMENTSCGA 1976
10 · RANDOM SQUARESHERBERT W. FRANKE
CREDITED STUDY
Three independent planes draw unfilled squares from discrete size grids. Every overlap remains visible.
Herbert W. Franke · 1967
THREE PLANES · PLOTTING
Herbert W. Franke / Random Squares / c. 1967 / Computer Graphics and Art, May 1976 p. 6