Mark Wyner Won’t Comply 
These cubes aren’t moving or changing (as implied by the arrows). At all. Not even a little. Other than the color toggle, they remain constant.
(Credit: Ja Gari Kin)
EDIT: added content warning because of the flashing.
r҉ustic cy͠be̸rpu̵nk🤠🤖@markwyner This would be a fantastic object to make physically, with LED light strips and a center display for the arrows
William@cypnk @markwyner sadly no. Look closer at the lines, they are not a single line; you would need an LED at least 4 pixels wide.
They are a thin line and a thick line, and the relationship of the two defines the perceived motion. Particularly evident in the rotating examples where the "thin" line is a wedge along two opposite corners of a thick line.
Megahertz