Son of the Fly

A man walked past a wall covered in sunlight.
He swatted at a fly that rested there.
Why should a fly get to enjoy the sunny day?

The fly didn't go far, it found a leaf
on a new spring flower. It held its wings
shining back light.

The man went into a tall building
and reappeared a minute later
trapped behind a window.

Annotated 'Son of the Fly':
This is my Drive-In movie idea
written two days ago on the first
sunny day we've had in a long time.
koan: which one is son of the fly?