I really hate it when the day starts with a test, don't you? (That's probably a hold-over from school days.)
Anyway, here's an optical illusion that's making its way across the Internet. It's even got a name.. the Coffer Illusion.
And I'm really excited because my eyes found the circles almost immediately... all 16 of them!
Need a hint? Try looking at the lines between the rectangles and see if anything pops up!