we will control the horizontal. we will control the vertical.

Via Boing Boing, shake your head slightly—as if signalling no (or affirmation in some parts of Greece and the Balkans) to reveal a hidden image in the seemingly uniform bars plus a brilliant tutorial on how to make one’s own with any image. Perhaps a clever engineer could using this method—which is a variation on the Bezold effect in gradated contrast, slip in a secret subliminal message into one of the sections of picket fence steel slats of Trump’s Border Wall.