Are you ready for an amazing illusion guys? Before looking at the image, do read the instructions first. Yu can see two lighthouses in the image below. There is a visible partition between the two images. You would be easily able to notice that the right image is sharper than the left one. Now just concentrate on the right (sharper one). Very soon, you will find that it will turn blurred and now the left image will turn sharper. Go on and try the same with the left image and you will now see it blurred while the other will appear sharper.