Autistic artist is drawing the NY skyline from memory

A British artist named Stephen Wiltshire is drawing the New York city skyline, on an 18 foot canvas, solely from memory.

From Design Boom:

wiltshire diagnosed with autism at the age of three displays an unusually powerful photographic memory that he has applied to rendering cityscapes. 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. he memorizes their shapes, locations and the architecture.

He started on the drawing Monday, October 26th, and is expected to be done by Friday. You can see a live webcam of his progress here.