Abstract: The present invention is a system that comprises interlocking modular shapes and a proprietary spline attachment. The system is an interchangeable containment system made up of open faced modular shapes. Each modular shape has at least one groove that runs along at least one surface of its face. Proprietary splines are used to connect (yoke) the surfaces together via the grooves. The modular shapes can be connected to each other by sliding the proprietary spline into the grooves of the two surfaces. The interlocking system allows for multiple modular shapes to be connected to each other creating larger structures. These structures are not fixed, permitting reconfigurations for alternate uses. The shapes are adaptable for varying purposes, and with the use of basic parts, allowing the system to be useable by any age and be interchangeable at any time.