Castiglioni was born on 16 February 1918 in Milan, in Lombardy, in northern Italy. He was the third son of the sculptor Giannino Castiglioni and his wife Livia Bolla. His elder brothers Livio and Pier Giacomo were both architects. After his degree, Castiglioni joined the architectural design practice that his brothers Livio and Pier Giacomo had started with Luigi Caccia Dominioni in 1938. Much of their work was in exhibition design, but they also carried out a number of architectural projects.
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