This great painting by Donald 'Rusty' Rust is hiding something, can you find it? See more of Rusty's work in our gallery 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.
Rotating Snakes - Akiyoshi Kitaoka - Shown with permission
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