Few days ago user caled Comanche sent us this interesting optical illusion. At first I didn’t notice the illusion behind it, but next time I saw it, I noticed it immediately (eventhough, only by pure accident). Try to look at the image, then close your eyes, then open them again, and as your eyes try to focus the image, the white line seems t expand! Hope it works for you! You have to practice a bit, unfortunately. This is what Comanche originally said about his work:
I saw this illusion when I tried to do something in photoshop. Look at the line in the middle and blink. After that the line looks as it becomes bigger. Hope you can see that too, and it’s not only my imagination.