Sella stool, 1983 (1957) Achille and Pier Giacomo Castiglioni Leather, pink lacquered steel, and cast iron, 28 x 13" Manufactured by Zanotta Lent by M2L Available from the MoMA Design Store   Sella (saddle) is the pivoting stool that garnered the Castiglionis an incongruous "Dadaist" label. With this seat, the brothers designed a new behavior, a hybrid between sitting and pacing nervously, because, says Achille, "When I use a pay phone, I like to move around, but I also would like to sit, but not completely."