English: Proto Tensegrity by Kārlis Johansons (in Russian/German as Karl Ioganson). Emmerich (1988) reported that the first proto-tensegrity system, called "Gleichgewichtkonstruktion", was created by a certain Karl Ioganson in 1920. it was a structure consisting of three bars, seven cords and an eighth cable without tension serving to change the configuration of the system, but maintaining its equilibrium. He adds that this configuration was very similar to the proto-system invented by him, the "Elementary Equilibrium", with three struts and nine cables. All the same, the absence of pre-stress, which is one of the characteristics of tensegrity systems, does not allow Ioganson's “sculpture-structure” to be considered the first of this kind of structures.