My light rail train coasted to a stop
next to a fenced off neighborhood playground adorned with brightly colored plastic swings and see-saws.
The yard of the playground was covered in several inches of soft chipped tree wood and bark.

A two year old knelt,
picked up a handful of bark,
teetered upright a moment and "threw" it.
Five tries.
He perfected his pitch.

Gather bark.
Release bark.
Yank arm up.

Timing was important.
Yanking the arm up before gathering bark only flicked a few pieces of bark into the air.
Gathering the bark, then yanking the arm up and releasing too late made the bark fall out of his open raised palm
onto the top his head.