Gatefold announcement card published in conjunction with birthday party for Leo Castelli held at the Palladium, New York, September 19, 1985. Card features photograph by Hans Namuth of Castelli with his artists: Ellsworth Kelly, Dan Flavin, Joseph Kosuth, Richard Serra, Lawrence Weiner, Nassos Daphnis, Jasper Johns, Claes Oldenburg, Salvatore Scarpitta, Richard Artschwager, Mia Westerlund Roosen, Cletus Johnson, Keith Sonnier, Andy Warhol, Robert Rauschenberg, Edward Ruscha, James Rosenquist and Robert Barry.