Since childhood, whenever I look at the full moon, I see the profile of a woman. What do you see? I have never been able to see any other pattern. [On the computer screen you will see such patterns most "clearly" by squinting slightly, to reduce the sharpness of your vision.]

You might ask the following question. What evolutionary advantage does this tendency to see a pattern (often a very consistent, unchanging pattern) in total randomness confer to humans?

Now here's a real vision test for you. Stare intently at the blurred rectangle below for about 30 seconds. Can you see a giraffe? Or are you hallucinating?

Finally, do you see anything on the far side of the moon, the side never visible from earth? Find out here.