Antoni Bonet i Castellana (Barcelona, 1913–1989) was a Spanish architect from Catalonia, designer and urban planner.
[2][3][4] He is best remembered as one of the designers of the "BKF" Butterfly chair,[5] as part of the Austral Group, in Buenos Aires, Argentina in 1938, along with partners Juan Kurchan and Jorge Ferrari Hardoy.
From 1971 through 1975, his studio in Barcelona Spain, was run by the head of studio, Miguel Cervantes Martinez Brocca, a Uruguayan architect who then became head of the Central office of Bellas Artes of Spain.
He told the story of how Knoll came to Buenos Aires in the 1940s and bought the rights to produce the Butterfly chair.
He was a true "maestro" and working on the Lower apartments at La Manga was like something out of an Ayn Rand novel in this extremely detail-oriented approach to design.