Abstract: Disclosed is a structural space element which consists of a tube having joining collars on its outer surface which protrude with equal depth throughout their perimeter. The joining collars are thicker along the side walls of the element. The thicker parts serve as vertical pillars. The collars are arranged in such a manner that the element is likable to corresponding other structural elements, situated at an angle of 180.degree. in relation to this element. Linked together the elements form a beam-pillar-ring system in which the elements are disposed opposite and imbricately to each other.