Flying cat Source/credit: lofoforos What am I looking at? The greasy stain on the floor in front of the bucket looks like a shadow. Your brain will then conclude that it is a flying cat on a bucket. More optical illusions:Scale Model of a CourtyardScreaming up or down?Swamp monsterBaby OstrichCross-stitch CatsOminous birdLap TigerSome shiny legs