Nope, no footing. <shrug> I dunno. I just do what the boss says. It is surrounded by brick garden walls and concrete foundations. The area is carefully cut down to some arcane point using a flat-head shovel and leveled. Then weed fabric is set down and covered with a few inches of cleaned sand. Then the bricks are laid out, then the sand is swept between 'em. That way it is semi-permeable, I guess.
The first one looked like this when it was finished:
The second one (which is supposed to be like a second drop of rain plopping into a pond and meeting the first) looks like this in its partly finished state: