I wonder if Douglas Adams was aware of this when he wrote:
the Triganic Pu has its own very special problems. It exchange rate of eight Ningis
to one Pu is simple enough, but since Ningi is a triangular rubber coin six thousand
eight hundred miles along each side, no one has ever collected enough to own one Pu.
Nigis are not negotiable currency, because Galactibanks refuse to deal in fiddling
small change.
