a modular system for forming without tools a variety of 3 - dimensional structures comprises panels , and connectors , and locking bridging members for assembling the panels together in a desired configuration . the panels can be disconnected so that the erected structure can be disassembled with ease for future reuse . the system can be used to erect children &# 39 ; s playhouses made of polymer materials , as well as in a large variety of other applications to create 3 - dimensional objects requiring rapid positive construction without tools .