Because it’s fun, frequently free, and can be made by all.
It can be as simple as a well-placed rock on a stump
Or small stones perched on a hunk of granite.
Or a temple built with beach rocks.
That fun is just lying in the sand.
Opportunity abounds.
And for those higher ambitions:
Art is all around. Why not make some?
Because the world needs all the artists it can get.