See the amazing picture by an autistic artist who drew London from memory after a single helicopter trip This picture depicting the London skyline in fine detail was drawn after just one flight over the city and purely from memory. Stephen Wiltshire, who was diagnosed with autism at the age of three, memorised the appearance and position of hundreds of London's buildings in exact scale during a helicopter ride along the Thames. Over the next five days, the 33-year-old drew the seven-square mile panorama, including landmarks such as the Swiss Re tower, and Canary Wharf, on a 13ft curving canvas....