Mind Breakers - The best Puzzles, Riddles, Quizes and Games. Optical illusion. Well, it just says try to concentrate on the image 1 minute and slowly will appear the boat in the background. woah... thats weird.it took my t least 10 seconds to relize there was a boat in the background!

Appearing boat
This is amazing. I have no idea how it works. OK, first wait and read this page in detail two times. Then stare at this picture and within about 20-30 seconds you can see a boat in the background. It's really amazing.