Abstract: A system for modular construction which is comprised of a plurality of related structural units, each of which is slotted and interlocked to form an assembly requiring no tools or fasteners. The system provides infinite scalability employing a systematized gridlike formation. The units may be assembled, disassembled, and reassembled in a variety of configurations. Each structural unit comprises a planar piece having a plurality of parallel interlocking slots of specific length. Each unit is connected to additional unit pieces through interlocking slot connections wherein each unit is placed in perpendicular arrangement to other units and the slots interconnect to fit the units together. The assembled units exist in a grid-like pattern and establish planar boundaries in space. The boundaries defined by the assembly are expandable in all three dimensions based on the number and type of the different related units used.