Abstract: A foldable and curvilinearly extensible structure fabricated from a plurality of foldable and extensible base modules. Each base module is fabricated from six rigid members swivelly connected end-to-end in a closed figure with intersecting rigid members being pivotally connected. The length of the first and fourth rigid members is selectively predetermined to provide the overall triangular configuration of the structure with a generally isosceles triangular configuration. Importantly, the placement of pivots in the second and fifth rigid members and the third and sixth rigid members is predetermined by the length to the midpoint of the first and fourth rigid members. A plurality of base modules are selectively interconnected at adjacent swivels to thereby provide the enlarged, foldable and curvilinearly extensible truss-like structure.

Abstract: A foldable and extensible structure fabricated from one or more foldable and extensible base modules. Each base module is fabricated from six rigid members swivelly interconnected end-to-end in a closed figure with intersecting rigid members being pivotally connected. A plurality of base modules are selectively interconnected at adjacent swivels and, selectively, with additional rigid members or struts to thereby provide an enlarged, foldable and extensible truss-like structure. In one preferred embodiment, a plurality of base modules are interconnected in an end-to-end configuration to form an elongated, three-dimensional structure which folds into a triangular configuration having a relatively flat profile while, simultaneously, being extensible at a relatively high ratio to form the elongated structure. The base module can also be configurated as a collapsible and portable stool by being fitted with a triangular seat structure.