A 20-minute flyover is all Stephen Wiltshire needs to create a stunningly detailed skyline drawing from memory. Now, the artist who has autism is taking on New York City.

Wiltshire, 35, was diagnosed with severe autism at age 3. But his amazing talent emerged when Wiltshire took a school trip to London’s Albert Hall and he returned to draw an exact replica of the building. Since then, Wiltshire has drawn panoramas of London, Tokyo, Hong Kong, Rome, Madrid, Frankfurt, Dubai and Jerusalem. He says New York will be his finale.

Last Friday Wiltshire took in New York via helicopter and he will spend this week creating his panorama. His progress can be monitored in real time via web cam. Wiltshire expects to complete the work by Friday, CBS News reports.

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