John Altoon, Billy Al Bengston (on Thonet chair) and Irving Blum, 1960 Bengston paintings on the back wall. Photo: Ferus, Gagosian John Altoon painting on the left, Thonet chairs and Billy Al Bengston painting on the back wall. It would have been awesome if Billy Al would have come over after his talk at the art show next door and sat in one of those Thonet chairs. Reform Gallery booth, Palm Springs Modernism