Nearly everybody has at some time been struck by the strangely accurate
shapes made by the shadows cast by the edges of a pile of irregular
formation, such as a heap of books, &c.
[Illustration: Fig. 129.]
[Illustration: Fig. 130.]
The heads of pipes, sword-hilts, umbrellas, and canes can be turned into
shapes unrecognizable as at all human, yet giving a shadow, of which the
outline reproduces the profile of some eminent man.