In order to bring life to a VRML world shapes are used. Shapes are the building blocks of a VRML world. To build these shapes, a shape node is use. A shape node builds shape, appearance and geometry. Appearance defines color and texture.
Geometry defines form or structure.
Geometry node fields control dimensions. Dimensions are usually described in meters, but it can be anything. Once shapes are defined, building a VRML world becomes simple. In order to organize the structure of a world, one must be able to visualize the coordinate system. To understand the coordinate system, look at the far-left corner of your desk.