Fraser spiral "is the most influential graphic illusion of one. You can see is like a spiral, but in fact it is a series of concentric circles well! Site graphics so clever, so will lead to your fingers along the wrong Locating it in the direction of the track.

[Analysis] a small round of "winding flu" delivered through the great circle had a spiral effect. Cover half of the illustrations, hallucinations will no longer play a role. 1906 British psychologist James Fraser has created a whole series of winding line illusion picture




















The flower of love: you can see the rose petals in the two lovers? »

[Analysis]: Swiss artist Sandro Dell Purui Te created a site full of romance, there are ambiguities, ambiguous meaning of the illusion works.