Modular Robotics MOSS Exofabulatronixx 5200 is a robot construction kit from Modular Robotics. Each block is a different part of a robot and combining those blocks in different ways yields a multitudinous variety of robots. Think of them as building blocks for the 21st century; designed to help kids invent and build their own robotic creations. The goal of MOSS is to impart intuitive understanding of complex systems and design principles. Within the MOSS system, kids begin to build an understanding of mechanical construction, basic circuitry, kinematic motion, robotics, software integration and programming.