Water drop Source/credit: Savir_Ekim What am I looking at? Because we automatically assume that light should come from the top of the image, we can’t wrap our brains around this image. Try to rotate the image 180 and see it upside down. Now it is clearly a waterdrop that has fallen onto a tile of a kitchen floor. Another example of this type of illusion is the sand dunes/artificial leather. More optical illusions:The InvasionPaperthin BuildingTokyo ViewRainbow RoadBeautiful CaterpillarA couple of cars in a parking lotBig bottomsPerfectly Polished