I quote:

In this video, wooden balls roll up the slopes just as if they are pulled by a magnet. The behavior of the balls seems impossible, because it is against the gravity. The video is not a computer graphic, but a real scene. What is actually happening is that the orientations of the slopes are perceived oppositely, and hence the descending motion is misinterpreted as ascending motion. This illusion is remarkable in that it is generated by a three-dimensional solid object and physical motion, instead of a two-dimensional picture.

Wow.

1. The Thatcher Effect

This image looks pretty normal when viewed upside down, even though the mouth and eyes are inverted in both versions of the image. Really. Turn your laptop upside down, right now. Behold, the Thatcher Effect.

Researchers from Emory University attribute the phenomenon to our sensitivity to the relationship between facial features in upright faces, a sensitivity that also allows us to differentiate between faces and recognize familiar faces. Read more.

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