Advertise here with Carbon Ads

This site is made possible by member support. ❤️

Big thanks to Arcustech for hosting the site and offering amazing tech support.

When you buy through links on kottke.org, I may earn an affiliate commission. Thanks for supporting the site!

kottke.org. home of fine hypertext products since 1998.

🍔  💀  📸  😭  🕳️  🤠  🎬  🥔

posted by Jason Kottke  ·  gift link

Freaky optical illusion

Which gray block is actually darker? Hold something over the seam to find out.

Optical Illusion Blocks

Mindblowing, right? Now for the fun science part: how does this effect work? Well, it works because whoever made this thing is a fucking witch. I mean, Jesus. QED. (via ★interesting-links)