Fractals are curious geometrical figures which often exhibit
*self-similarity*: part of the figure is a smaller copy of the whole
figure. Many natural phenomena have this type of structure.

This pictures shows mathematically generated *fractal trees*,
where each main branch is a smaller copy of the whole tree. The
pattern of stones in the picture also exhibits self-similarity.

Similar mathematical ideas are used in computer graphics and cinematography for the creation of all sorts of visual illusions.

Nigel O'Brian, Sydney Mathematics and Statistics, 24 Oct 1996 . . .