Just keep looking at this optical of blue flowers, is there something in the background or not?
Are the dots around the edge of the Optical Spy Clock actually rotating or just changing color?
These arches are very unusual and the sunshine seems to be from a different place on the top compared with the bottom.
Silly question I know, but which way are these arrows pointing?
Stare intently at the red dot at the center and the blue circle will disappear. Just like Troxler's fading shown here 
Can you see the white circles? How many can you see? Or do you see white diagonal lines?
 Here is a great picture of Derren Brown, one of our heroes. But the picture seems a little strange upside down.
The figures, be they teddy bear, Lego men, origami or wooden are photographed - as are the cups and accessories. The impossible objects were created entirely in the computer using 2D drawing and painting software. The third image depicts an object made with Meccano, a wonderful construction kit that sadly has all but disappeared now. It was a huge success in post World War II England and was an important part of my childhood. The origami figure was folded by me from a design by the Spanish origami artist Miguel Salvatella. These images are based upon the well known “tribar” or “Penrose Triangle”. Via David Macdonald. Visit our gallery here.
No photoshopping here, just caught the guy jumping in at exactly the right moment.
 Here is a difficult one to get your head around, are the red blocks moving left or right? First follow the top black balls, then the bottom ones. Strange!
Can you see the Z in the Zune logo? Just click on the logo to find it.  Here is one of our compilation videos that we have put together for your entertainment.
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