Swiss design crystallized in the 1950s at the Basel School of Design and the Zurich School of Arts and Crafts. Josef Muller-Brockmann, Armin Hofmann, and Emil Ruder codified its principles: mathematical grids, objective photography, and sans-serif typography — especially Helvetica, released by the Haas foundry in 1957.
The movement rejected the expressive, illustrative traditions of earlier graphic design. It pursued a "universal" visual language that could communicate across cultures without relying on cultural context. The grid wasn't a tool — it was an ideology.
By the 1960s, the International Typographic Style had spread globally, becoming the default for corporate identity (IBM, Lufthansa, the New York City subway system). Its influence never fully waned. Modern frameworks like Material Design and most "clean" UI patterns are direct descendants. When you center-align nothing and left-align everything, you're speaking Swiss.