In his book (design) stories Felix Wiedler shows some pictures of the exhibition catalog and writes (in all lowercase):
in 1945, an exhibition about modern architecture in the u.s.a. was shown in zurich. max bill (1908–1994) designed the poster and catalogue cover. squares standing on a corner are a format that bill often used in his paintings, too – influenced by mondrian. bill preferred all lowercase spelling, as seen in the museum’s name and his signature.