there is a pool,
you can easily draw from it,
it is refilled slowly,
the pool has no gauge.
you have to guess its level.
the pool contains a potent fuel,
the water of life, which burns bright,
and can be used for many wonderful things.
countless unremarkable balances depend on the pool,
if it dries up there is damage,
if it gets to low, things start to rip at the seams.
you will not immediately notice when this happens.