Here’s an image that recently blew my little mind. It’s called the “Coffer Illusion.” When you look at it, you’ll either see four rows of rectangles or sixteen circles. You probably won’t see both. But the rectangles and the circles are all right there, in plain sight.
When I first saw the Coffer Illusion, the circles were thin on the ground. Absent, in fact. Squinting didn’t help. Crossing my eyes didn’t either. Then my gaze relaxed slightly, and sixteen circles seemed to pop into existence. Then they were gone. The rectangles took over again. But now I knew the circles [...]









