The keystone holds the arch, one of the oldest and strongest and of all architectural forms. The Keystone lounge chair comprises three autonomous yet symbiotic elements: a concrete back that buttresses the spine, a gently curved ceramic arch for your sit-bone, and the wedge-shaped rubber voussoir that supports and completes the arch.

The chair was originally a 450-kilo sculpture, exhibited at a Milanese art gallery in 2014. Thomas Ibsen from Please Wait to be Seated approached its Dutch designers, OS & OOS, and said, “Why not get this down to 30 kilos and upholster it? Turn it into a comfortable and practical piece of furniture?” He then teamed up with Kvadrat to use their exclusive Raf Simons design collection. The chair has since become a collectors’ item, sold to galleries and contemporary art showrooms across the globe.

A word of warning, though: it’s not just sit-bone friendly; kids love clambering all over it. So the chair gets our one-off label: PWTBSBTOYSFK (Please Wait to be Seated But Take Off Your Shoes First, Kids).

Origin Made in Denmark 

Size
91 x 80 x 86 cm
36 x 31.5 x 34"