#417Optical Illusions

Three classic geometric illusions generated entirely in-shader and slowly crossfaded: a Café Wall whose staggered mortar rows look wedged and sloping, an Ouchi disk of orthogonal brickwork that floats and jitters free of its ground, and a Hering fan of radiating spokes that bows two dead-straight verticals outward. Scroll pumps the illusion strength, holding the pointer spins the cycle faster, and the cursor lends a slight parallax drift.