However this is only utilised if the mentor is sensitive about the role they play. Whether the mentor is within the environment or not is largely immaterial. If the mentor remains outside the environment the pupils have the ability to assume the role themselves with only loose direction been provided externally. In the Devrl project this form of environment is provided by Friction World. This environment is comprised of 10 spheres which roll around the floor of a rectangular room.
Collisions occur between the spheres, and between the spheres and the room walls.
These interactions obey the basic laws of Conservation of Momentum and Conservation of Energy. Users may move through the environment or take the reference frame of one of the spheres. The opportunity for interaction is provided, users may either bind spheres together, firing them apart later, or jump from one sphere to another. Despite the rich environment provided there is no in-built structure to its use. Sensitive planning must be made to achieve the best use of the resource.