The design of three seating furniture is based on three basic postures of the human body: supine position ,then a position similar to semi Fowler’s position and finally a perching position, a stance between sitting and standing. Also, a social-urban sitting is composed by using two of the produced furniture. Analysis started with the development of a graphical algorithm where a computer tomography scan of user’s spine is evaluated with a very simple machine learning component. Parameters like height and angles of the furniture change the outcome geometry according to the user. More specifically, sitting furniture even nowadays are more based on designing principles and norms of the past, which are proven that are not optimum for the human body. Of course, there is no perfect posture but the next posture is the best as Peter Opsvik, wrote. This thesis is not an effort of reinventing the wheel, but an approach of finding a static position more suitable and optimum for the human body, where human spine is not curved (like a C instead of its S shape) after a while of sitting. Although this is not an architectural problem completely, but it is a design problem which affects the architectural design of an accommodation in very big way.