671 Coffer illusion and the hidden circles

- Hey gang, this is Deke McClelland.…Welcome to Deke's Techniques.…This week, I'm going to share with you how to create…an absolutely mind-bending optical illusion;…and it's this guy right here, originally created…by a guy named Anthony Norcia.…It's spelled Norcia, but I think it's pronounced Norcia.…And he called it the Coffer Illusion, coffer being…an architectural term for inset panels.…And even though it looks like we're seeing…a bunch of rectangles, we're actually looking…at a total, get this, of 16 circles.…

Now it might seem like we should be using Illustrator…for this artwork, but we're actually going to be…using Photoshop because that way we can…express the circles as big pixels.…Now some of you might be looking at this…and thinking, I got news for you, Deke,…those are what's known as rectangles.…There's as many circles in that thing…you're holding up as there are triangles.…Well, does this help?…And the thing is, once you see those 16 circles,…you can't unsee them; they're absolutely obvious.…Here, let me show you exactly how it works.…