Figures:
As soon as the cubic belt (A) is freed from
its interlocking parts (B), it may be inverted, with the short edges, which
are part of the pole edges within the cube, serving as hinges. In the course
of this inversion it will assume, one after the other, positions C, D, and
E as well as the one shown in the initial picture. The distance between
the points, which is marked by arrows, always remains the same.