The chair has short legs and the seat-surface (1) is raised on bothsides (3,3 ') and if Necessary at the front. The front is Widened. The armchair is angepasst to the sitter's body-shape. The back of the seat surface has a raised part (4) in the middle, forming at extension to the sitter's coccyx. The back-rest (2) has to outward bulge (5) Positioned near the sitter's fourth and fifth lumbar vertebra. The seat surface May so have inward bulges near the two cheeks of the sitter's bottom
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