THE MAGIC OCTAGON.
Out of a piece of stiff cardboard, cut four of each of the three designs shown in Fig. 15, A, and so join them together that they form an octagon figure. The pieces numbered 1 are to be fitted together in the centre, the pieces 2 and 3 being placed alternately round the pieces numbered 1, after those pieces have been fitted together (Fig. 15, B).
Fig. 15.—The Magic Octagon—a, The Pieces; b, The Octagon.