An eddy is a swirling of a fluid
and the reverse current created
when the fluid flows past an obstacle.
I am a rock . . .
The moving fluid
creates a space devoid
of downstream-flowing fluid
on the downstream side of the object.
I am an island . .
Fluid behind the obstacle flows into the void
creating a swirl of fluid
on each edge of the obstacle
followed by a short reverse flow
of fluid behind the obstacle
toward the back of the obstacle.
And a rock feels no pain . . .
is most visible
And an island never cries . . .
Text source: verbatim from Wikipedia and Paul Simon lyrics from “I am a Rock”