Back when I was just a "kid with a dream" I met the preeminent architectural perspectivist, Steve Oles. He was one of those rare people who are both a genius and a gentleman. The gentleman was soft spoken and courteous, with a barely noticeable southern accent. The genius manifested itself as we walked through midtown Manhattan, and he pointed out the various effects of light in the city canyons.
See also Natural Spotlights.