Toys shape the way children think about the world. The mission of Modular Robotics, a recent start-up company in Boulder, Colorado is to develop innovative robotics construction kits. Through play these kits foster insight and creativity in general and in STEM fields in particular. A new and expanding company catalyzed by NSF SBIR funding, Modular Robotics designed, developed, and brought to market its first product, Cubelets. Cubelets are small plastic blocks that snap together magnetically to make robots. The kits include Sense Cubelets, Think Cubelets, and Action Cubelets. Snap them together with a battery block and you’ve built a working robot.