In this colorization by @hodefoting, only the gridlines contain color, the photo is black and white. But you see colors. This is a visualization of the Munker illusion https://t.co/QLDJSRMCaA [more on the author's site: https://t.co/Cf7mvLTU1b] pic.twitter.com/3A938tNvyU

— Massimo (@Rainmaker1973) July 27, 2019