For “Strange but True,” an exhibition of forty new 20-by-24-inch color Polaroids featuring William Wegman’s weimaraners, the photographer took as his inspiration sideshow banners from the ’40s and ’50s. The dogs were placed in front of the banners along with such props as ropes, nets, costumes, and wigs. The resulting photographic fantasies played on the irony of words and the perfidy of images through cleverly humorous juxtapositions. Using one of the rare large-format Polaroid cameras that he first began working with in 1978, Wegman and his team of assistants shot most of the photos right in