Imagine American history from 1935 to 1985 all played out at once with shadow puppets. We’re pretty much talking cultural icon heaven here.”Leaves of Grass” is an amazing collection of snippets from the past. The enormous series made Canadian artist Geoffrey Farmer consists entirely of clippings and photographs from the American Life magazine. Each image is mounted on a little post as if it were a functional puppet. The display represents five very full decades of diverse culture.