THE S 840: DESIGN-PERFECT SITTING COMFORT CONFERENCE AND LIVING AREAS High-quality visitor’s and conference chair with a special aesthetic appeal. Its unique characteristic is the accentuated separation of shell and frame. The moulded plywood seat shell has formal analogies to automobile design in the shape of the surfaces – translated to wood as a material at Thonet. The ergonomic shape with special upholstery offers high seating comfort. The use of diverse veneers and stains and various upholstery covers in leather or fabric change the character of the chair and allow it to fit in with any interior design environment. Various backrest heights and foot frames are available. Base frame with four-star swivel base with gliders, or five-star swivel base with castors and tilt mechanism. Moulded plywood shell in stained beech, oak and walnut. Comfort cushion covered with leather or fabric.