In [[EM.Cube]], objects are generally categorized into four types: solids, surfaces, curves and special objects.
*Curves are one-dimensional objects, whose length can be measured. The simplest curve object is a (straight) line. Other curve objects include circle, super-quadratic curve, parabola, hyperbola, spiral curve, helix, polyline and NURBS curve. [[EM.Cube]] also provides a generalize curve generator. *Surfaces are two-dimensional objects whose surface area can be measured. A surface is usually characterized by a number of edges that enclose the object's area. The edges meet at vertices or nodes. The simplest surface object is a rectangle strip, which has four edges and four vertices. Other surface objects include circle strip, radial strip, ellipse strip, taper strip, regular polygon, spiral strip, polystrip and NURBS curve. [[EM.Cube]] also provides a generalized surface generator. *Solids are three-dimensional objects whose volume can be measured. A solid is usually characterized by a number of faces that enclose the object's volume. Faces meet at edges and edges meet at vertices or nodes. The simplest solid object is a box, which has six faces, twelve edges and eight vertices. Other solid objects include cylinder, cone, pyramid, sphere, ellipsoid and taper. [[EM.Cube]] also provides a Platonic solid generator which includes tetrahedron, tessellated hexahedron, octahedron, tessellated dodecahedron and icosahedron.
*[[EM.Cube]] currently offers two special object types: point and fractal tree. A Point is a dimensionless object that is represented by a set of coordinates (X,Y,Z). A fractal tree is a group of recursively scaled self-similar objects.