Abstract: The invention is a structure, comprising a first functional element (11) and a second functional element (12), said functional elements (11, 12) being form-retentive and being cooperatively functional in an operational state of the structure, in said operational state the functional elements (11, 12) having a predetermined relative spatial arrangement and being distanced from each other; a tension assembly (20) coupling the functional elements (11, 12) to each other, the tension assembly (20) being adapted to be taut in said operational state and being coupled to the first functional element (11) by respective first couplings and to the second functional element (12) by respective second couplings; the functional elements (11, 12), the couplings and the tension assembly (20) together forming a tensioned assembly; and a tensioning assembly (30) coupled to the tensioned assembly, the tensioning assembly (30) being adapted to exert a repulsive force distancing the first functional element (11) and the second