L.E.G.O. − An interactive graphics system for teaching geometry and computer graphics

L.E.G.O. is an interactive graphics system for creating, viewing and manipulating two−dimensional geometric figures and three−dimensional objects. The fundamental operations of the L.E.G.O. language form an electronic metaphor of geometric constructions with a straightedge and compass. This is consistent with the primary application of L.E.G.O., i.e. computer−assisted instruction of geometry. L.E.G.O. is also useful when teaching or studying other areas difficult to grasp without good visual aids, such as mechanics and computer graphics. The system can be used both as an interactive environment for experimenting with geometric constructions and as a tool for preparing illustrations.