Building toy

A building toy comprising a set of flat shape-forming modular elements made of a flexible resilient material in the shape of geometric figures and having opposing surfaces, wherein:

• for each flat shape-forming modular element:
• the modular element has at least one double-sided fixation device comprising a coaxial pair of fastening elements, each fastening element of the pair of fastening elements having (i) a base surface in contact with a respective one of the opposing surfaces of the modular element and (ii) a mating surface, the mating surfaces of the pair of fastening elements being oppositely oriented;
• and
• the modular element has a through hole, wherein:
• the double-sided fixation device fixation device has a central rod made of solid resilient material, passing through the through hole and connecting the base surfaces of the fastening elements of the pair of fastening elements to each other;
• the length of the rod is less than the thickness of the modular element causing resilient deformation of the surfaces of the modular element at their point of contact with the bases with partial indentation of the bases into the surfaces of the modular elements;
• and
• the mating surfaces of the fastening elements of a modular element in the set are configured to engage with the mating surfaces of the fastening elements of other modular elements in the set to form detachable joints to hold connected portions of the surfaces together, with the fastening elements forming centers of axial rotation of at least the held portions of the surfaces of the connected modular elements.