Most people know David Sifry as a technologist. But he has another side, a deep interest in photography. Check out Sifry’s donation to Arcadia: Artists Celebrate Trees. Arcadia benefits Friends of the Urban Forest—and the art auction is a great way for San Francisco’s technology community to give back to the greater community and acquire some great art at the same time. FUF has planted more than 40,000 trees in San Francisco. Imagine the City with 40,000 fewer trees and you can see what a difference FUF has made.