Ariel did some very smart optical illusion advertising in the past, and this one deserves to be mentioned as well. If only they would recognize how much free air time we give them, and decided to sponsor us. Unfortunately, I don’t see this happening any time soon :) Anyway, the latest flick has much to do with our blind spots, and every one of us has them. If you didn’t knew that, I recommend checking Wikipedia first! If you open the picture in full size, then cover your right eye and slowly move closer to the screen (while starring at the Ace icon on your right) – at some point the stain on your left will completely disappear! I fooled around a bit, and did something quite opposite; I’ve made the icon disappear, while the stain remained firm :) Check the #Ariel tag to see previous illusion billboards by this detergent company.