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Description
To my eyes, the squares that are attended/followed appear purple and the complementary set appear to flash red-blue.

The directions of motion are ambiguous, either left and right or up and down. Follow an intersection at a horizontal or vertical wall to switch between percepts.

It seems to me that the apparent motion "glitches" as the crossings in two directions pass as if they interfere with each other, though there is no change in the actual motion/intervals.

A full cycle of a discrete billiards orbit, on a 901 x 721 lattice with equal horizontal/vertical velocity components.

Description
To my eyes, the squares that are attended/followed appear purple and the complementary set appear to flash red-blue.

The directions of motion are ambiguous, either left and right or up and down. Follow an intersection at a horizontal or vertical wall to switch between percepts.

It seems to me that the apparent motion "glitches" as the crossings in two directions pass as if they interfere with each other, though there is no change in the actual motion/intervals.

A full cycle of a discrete billiards orbit, on a 901 x 721 lattice with equal horizontal/vertical velocity components.