The self-taught artist Gaston Chaissac was something of a social recluse. He lived in the suburbs of Paris, and unlike his contemporaries he did not attend salons and openings, and did not align himself with a school of painting. Instead he worked away on his peinture rustique et moderne (rustic modern painting). Chaissac did, however, admire the avant-garde CoBrA artists, whose ideas he shared. Eventually, Chaissac’s expressive style won the day. In 1961, a show of his art in Iris Clert’s gallery was a triumph, and though CoBrA had disbanded by then, its artists fought to buy up his paintings. This exhibition highlights the affinities, placing works by Chaissac and CoBrA in adjacent galleries. —E.C.