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In 1973, Pierre Chapo developed the T 21 table and the S 31 stool. With the S 34 chair, he completes the range of furniture with beam assembly. The complexity of the beam base on the seat forced Pierre Chapo to carry out further research, particularly in plane geometry, to obtain a perfect construction.
The diameter of the seat of the S 34 chair is too small to ensure the stability of the structure, and it is too large compared to the S 31 stool to borrow the tripod base. Pierre Chapo found the solution by designing a dihedral angle placed on the floor. The seat is placed in the middle of this angle and the backrest is placed at the top. This section rests on a transverse leg consolidated by the assembly of the other two legs which are interlocked to distribute the weight according to the stacking of the four legs. The last leg completes the assembly by resting on the first leg at a dihedral angle. The polygonal shape of the seat also allows for the most appropriate positioning for the perfect distribution of the seated individual's weight.