the strong point of the EUCLIDE chair is the contrast between the coldness of its structure and the natural materials of the back and the seat. EUCLIDE is made of cheap materials (steel sheet and wood) and simple production procedures such as folding, punching and welding for steel sheet, and folding, milling, veneering and drilling for the wood parts. Its structure could have some finishes (satin steel or brushed steel polished). Wood parts could be made of tinted oak, polished lacquered oak or could be leather coated