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Via Phil Plait, another wonderful illusion:
Plait has the full explanation (and a number of other links worth checking out), but here’s the critical part:
The key to this whole thing is the way your brain sees perspective, specifically convex and concave shapes, coupled with its uncanny ability to pick a face out of patterns (called pareidolia). Your brain wants to interpret the dragon as a face, and faces are convex: The sides of the face curve away from you (when you look at someone’s face, their nose is closer to you than their ears).
Definitely worth checking out!
Quick note about the promo results: 175 copies of Communion of Dreams were downloaded, including first-time downloads in Japan and Brazil! Her Final Year had a total of 63 downloads, and before the promo started someone in Australia bought a copy. I should be used to this by now, but I still really get a kick out of the fact that people around the world are reading both books.
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