Otra ilusión óptica

Two-direction flicker motion: center rows appear to move to the left; top and bottom rows, to the right. Squint, and the motion direction reverses.

Yet another demo from @JOI_illusion paper: https://t.co/DMrGoJrKf2 pic.twitter.com/raAUJ63I2A

— Arthur Shapiro (@agshapiro2) September 10, 2021