Happy International Day of Friendship—a whole day dedicated to celebrating your nearest and dearest! Pictured here are the renowned abstract expressionists Grace Hartigan and Helen Frankenthaler. Two of a cluster of successful women artists in a very male-dominated 1950s and sixties New York, the painters were famously close friends—a fact attested to by this wonderful picture of the pair in the throes of no-holds-barred laughter.
