Ludwig Mies van der Rohe: Citations en anglais
“Symmetry is the aesthetics of the stupid.”
An early appearance is "Symmetry is the aesthetics of the little man," which appears in the 1965 book Bauen auf dem Lande (Building in the Countryside), volumes 16-17. However, the quote has also variously been attributed to Picasso, Salvatore Dali and Friedensreich Hundertwasser.
Disputed
Source: "Symmetry is the aesthetics of the stupid." Mies van der Rohe (allegedly), 2018-01-21, 2017-11-12 http://falschzitate.blogspot.com/2017/11/symmetrie-ist-die-asthetik-der-dummen.html,
Actually Robert Browning, from Andrea del Sarto. "Less is often more" was used still earlier by Christoph Martin Wieland.
Misattributed
"On restraint in Design" in The New York Herald Tribune (28 June 1959)