problem.
with one ball on top, resting on four, which rested on nine, which rested on sixteen.
this was the common practice; it made a pyramid of cannon balls.
by doing this, a supply of 30 cannon balls could be stacked in a small area right next to the cannon.
but there was only one problem -- how to prevent the bottom layer from sliding/rolling from under the others.
the solution was a metal plate with 16 round indentations, called, for reasons unknown, a monkey.
but if this plate were made of iron, the iron balls would quickly rust to it.
the solution to the rusting problem was to make the monkey out of brass - so 