Lying brain
Apparently our brains interpret color by comparing them with their surroundings. The trick of this illusion is the orange lines cut through the green spirals but not through the blue spirals. It looks as if the orange lines cut through the blue spirals but they do not, those are pink lines cutting through blue, and this forces our brains to reinterpret both colors.
Egyptian cake pop-up card
This is one image in a series that describe in pictures the way the card looks when it's opened, its construction process, its cover, extraneous material, and wrapping that can be viewed here.
All the pop-up cards are listed for convenient access here at pop-up transition tank.
Obama pharaoh
On an executive trip to Cairo it's natural for the exchange of ideas to flow both ways.
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