 Click or hover to see the message when you leave
 Click or hover over the picture to reveal the true madman.
 So we have nice view of a room with a table and some white and grey floor tiles. But would you believe that the white tile directly under the table is exactly the same color as all the grey tiles? Click here to see the proof.
Image source unknown Yes, this is a copy of the famous Rotating Snakes Illusion by Akiyoshi Kitaoka, but we have made one important change. One of the snakes is actually moving. Can you find him? You can see a larger version here. Warning - This image might make observers feel sick
Downtown New York or Uptown Kuala Lumpur? Click or hover to reveal.
 If you stare at the red dot the yellow stars will disappear one by one.
This great painting by Donald 'Rusty' Rust is hiding something, can you find it? See more of Rusty's work in our gallery here.
Stare at the red dot on the left for 30 seconds and then look at the red dot on the right.
Inspired by 'The Spine Drift Illusion' by A. Kitaoka. Also see our original butterflies illusion here
This black disc is completely circular and is not spinning. It is just getting smaller and bigger.
Stare only at the red dot until the time runs down, then still only looking at the red dot you will notice that the presidents have changed places. But have they?
 Who can you see? Stand well back and look again. Image source unknown.
We have made a spinning spokes optical illusion for you. The illusion asks which way are the brown spokes in the middle moving? If you let your eye follow a green spoke around with a brown spoke underneath they both go the same way. Now if you follow an orange spoke with a brown spoke on top, they both go the opposite way.
 Stare intently at the blue spot for at least 20 seconds then look away at a white background and a famous Klingon will appear. yIlop! wa'leS chaq maHegh!
Today we have uploaded a new post in the spy blog detailing the history behind the creation of one of the world's greatest and most famous illusions - Akiyoshi Kitaoka's Rotating Snakes. 
Warning - This image might make observers feel sick. Click to enlarge
Which line is longer the red or the blue? We think you get this one fairly easily.
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