Here we ask the question which parts of the bridge are the longest, A & C or B & D? This is our take on a famous old illusion called the Jastrow Illusion.
If you keep you eye on one of the balls the other one seems to be all over the place. Then try it with the other ball.
This is a great picture of the atrium in the tallest building in the world, the Burj Dubai. But are we looking up or are we looking down?
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