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British artist Stephen Wiltshire has managed to draw the manhattan skyline from memory. These were drawn after a half hour helicopter trip over the city. 

Stephen Wiltshire was diagnosed with autism at the age of three and he has an unusually powerful photographic memory. He can look at the subject of his drawing once and reproduce it accurately with photographic detail, down to the exact number of columns or windows on a building.

Found at 7sobm.tumblr.com