There's a new optical illusion on the block, and it's a good one. Take a look at the image above. Take as much time as you want. It looks as though there's one, maybe two dots at the intersections ...

“They literally almost disappear,” says Sean Walker, an associate editor at Sky & Telescope, to Denise Chow at NBC News. “Normally you see the rings around Saturn, but when you have an edge ...