Abstract: A modular system of structural framing in which a multiplicity of pre-stressed compression frame modules are combined into frameworks of any required size by use of common connecting means such as plates and brackets. Each compression frame module comprises a plurality of framing members forming a polygonal frame, and a loop means longitudinally encircling the frame. Tension is applied to the loop. The ends of the framing members are shaped to provide a non-invasive means of engaging and joining abutting framing members. The tensioned loop serves as the single fastener holding the module together while simultaneously pre-stressing the module by putting it into compression, thereby achieving a synergistic strength. Additionally, separate non-invasive joints and a removable double-cam clamping device are provided to improve the functionality of the system and to facilitate use of interchangeable parts.