Geometric construction panel

A panel for use in building a geometric structure, made of a substantially planar and flexible material, namely, a film or a sheet having a thickness of from 0.10 to 0.75 mm and a weight per area of from 0.01 to 0.15 g/cm2 and capable of being curved and bent with human fingers, the panel comprising:

• a body having a geometric shape circumscribed by a plurality of edges, each of the edges being either a line segment or an arc;
• and
• at least one joint formation placed along some of or all of the edges, and consisting of a plurality of tabs spaced apart by at least one gap,
• each of the tabs being integral with the body, having a base along the edge, protruding out from the body at the base, expanding bilaterally and proximally from the base at an angle of more than 0 and less than 75 degree, and having no overlaps between the tabs, and
• each of the gaps being a part of the edge and also an interval between the adjacent bases,
• wherein a length of the base and a length of the gap along an outline of the edge are substantially equal within ±10%, and a position of the gap along the outline of the edge inversely corresponds to a position of one of the bases along the outline of the edge when the positon of the gap along the outline of the edge is inverted relative to a midpoint of the edge;
• wherein the joint formations along the edges of varied curvatures are alignedly, hingedly, and detachably interlocked with each other by twisting the panels with the fingers to individually hook the tabs at the gaps, and the flat, curved, or bent panel is used to build the structure.