Hans Hopfer "Castell" Sofa for Neue Wiener Werkstätte, Dark Brown Leather, 1972

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Hans Hopfer "Castell" sectional sofa for Neue Wiener Werkstätte, dark brown leather, Austria, 1972.

The living room, reimagined as a landscape.

Designed by Hans Hopfer, the Castell sofa dissolves the idea of fixed seating into a modular architecture of comfort. Built from geometric elements with softened edges, each configuration becomes a new composition—expanding, contracting, adapting to the rhythm of the space.

A connoisseur’s counterpart to the celebrated Mah Jong, Castell reflects the same radical vision: furniture not as a finished object, but as an open system. At a time when television and informal living were transforming domestic life, Hopfer proposed a sofa without a prescribed front or hierarchy—one that encouraged conversation, movement and endless reinterpretation.

More than fifty years later, Castell remains remarkably contemporary: a sculptural seating landscape where architecture meets ease.