Stare intently at the center of the left hand circle for 30 seconds and then look at the right hand circle.
This great photo by Dennis Hodges gives an illusionary look at the buildings of Manhattan. It takes a short while to get your head around the perspective but eventually it can be seen correctly.
I'm not sure what is going on here. If click onit and make it larger I can see moving lines and changing colors. How about you? Source unknown
A detail from William Kentridge's "Rebus" sculpture series. When viewed from another angle, the nude reveals the image of both a stamp and telephone.
Is this an apple tree or an orange tree. The only way to find out is to stare at the red dot for thirty seconds and then look at a white wall or ceiling and maybe keep blinking.
This fish illusion has been floating around (see what I did there) for a few years but until now never made it into the Optical Spy database. Source unknown
Stare intently at the white dot between the Green & Red tiles for 30 seconds and then look at the white dot between the dunes. Source TEDTalks
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