It began with Cows on Parade, first in Zurich in 1998 and a follow-up in Chicago in 1999. Since then, cities all over the world have done a similar public art project. Moose in Toronto, Pigs in Cincinnati, the Superlambanana in London, and ponies in Santa Fe all followed suit. The projects involve local artists painting the same subject, each putting his or her own spin on it, and placing them around the city. The most fun of these exhibits, Overalls All Over, is going on right now in Cedar Rapids, Iowa, during Grant Wood’s 125th birthday celebration.