milestones
millstones
smallstones
gallstones

the size of the stone doesn't matter;
the fact that water falls over it does.

you go around them, and i'll go over them, and everything will be fine.

what? you want to go around one again?
sorry, once i pass a stone i can never pass it again.
and everything will be fine as long as we use the same footprints.

you say that the water goes around the stones?
and you have to follow it?
sorry, it goes over, and only over, and only once. any manager could tell you that.

yes, of course you can follow the water.
it goes this way.
and everything will be fine as long as you use my footprints.