Illusion Times!

Hoping this guy's good on his promise to show a cool new illusion each week. This is the contrast/motion illusion, also known as "lucy in the sky" (note: you do not need acid to see the illusion).

The title of his blog is awesome:

"Illusion Sciences: why are we surprised by only some of the things that we see?"

So cool - always hard to remember that everything in our consciousness is being drawn up and processed by our brains at every second of every day. But there are mistakes everywhere, and the more we see the holes, the better we'll see reality.