As a child, one of the things I valued most was a plain flat wall, without doors or windows, with flat hard ground infront of it, for ball games that involved throwing the ball against the wall and carrying out various actions before catching it, some of which included the ball bouncing on the ground once before being caught.
The wall could also provide a support for handstands.

In Milborne Port on the Somerset/Dorset border there is a small public garden provided by a benefactor who had stipulated that it should include such a wall.