635 Black Red and Blue Zeilmaker Version is an armchair created by Gerrit Rietveld in 1920. The base is made of black stained beech with colored surfaces in white. Seat and back in green lacquered plywood. Choose from fabric or leather seat cushions. The chair was part of Cassina's MutAzioni series, which was created for teacher Wicher Zeilmaker, hence the name. Today the model can be found under the I Maestri collection and is considered a true design classic.