The combination of a central dilation and a rotation about the same center. However, the combination
of a central dilation and a rotation whose centers are distinct is also a
spiral symmetry. In fact, any two directly similar
figures are related either by a translation or by
a spiral symmetry (Coxeter and Greitzer 1967, p. 97).
A spiral similarity tessellation of any ordinary tessellation can be constructed by placing a series of polygonal tiles of decreasing size on an
equilateral spiral.
