Let me show you something I find quite puzzling. Back in the old days, there were these two optical illusions – one showing illusory triangles, and the other one made you believe there are black dots at the gird intersections, while in fact there weren’t any. I think that the illusion I’m about to show you, works as a combination of both previously mentioned ones. Just look at the simple grid I attached below. Even though it’s consisted of nothing but pile of crosses, yet you can clearly see white circles in the empty space between. How is that? If you try to narrow your vision, by squinting your eyes further observing the picture, the white circles become even more obvious?! Strange, right? Don’t know why, but I find something beautiful in such simple, yet effective illusions. How about you?