ABSTRACT
In contrast to the previous chapter, this chapter presents solids that are not regular (or semi-regular). Smooth, closed surfaces may form part of, or the whole of, the boundary of such solids in a way that the outward normal of the surface at any point is everywhere continuous in all directions about that point (for example, a sphere or torus). This chapter also contains a collection of surfaces with edges having no particular regularity or symmetry.
