Refraction

A hard scientific concept to explain
 light
It knows the fastest route
 ahead of time
and bends as it transitions,
 veers course
joyously following some cosmic efficiency
depending on the medium in which
 it finds itself
I throw the stick far down the creek
 thinking to guide Lexi into a long swim
with natural instinct she trots
 lengthwise down the watery beach
 and, in happenstance, selects
 the most efficient entrance to dive into the deep
Then there were those long minutes she spent
 at the edge of the pool
Determinedly awaiting the stick
 to drift to her