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As an artist, MC Escher is pretty corny but some of the visual paradoxes in his work are hard to resist. A recent New York Times article describes the efforts of a Dutch mathematician to fill in a mysterious "hole" in Escher's image The Print Gallery. In this picture a man in an art gallery is staring at a picture of a city, which spills out of the frame--in a weird anamorphic swirl--to become the city in which the man is standing. In a center of the image is a blank space, with the artist's signature. Was this a failure of imagination? Biting off more than the artist could chew mathematically? Well, thanks to the miracle of the computer (and retouch artists) we now know what should, logically, have gone in the hole: it's a picture of a man staring at a picture of a man staring at a picture of a man, etc., spiraling down to infinity. Below is Escher's original grid for the drawing (kind of nice, isn't it?), which was the starting point for a process of restoration/completion/meddling described in detail on this website.