Marking out the quiet garden

Marking out the quiet garden
Originally uploaded by davidjennings.
Playground
Originally uploaded by davidjennings.

The men in yellow coats were back today, and in this picture you can just about make out the yellow lines they've drawn. They've written MOUND inside these lines, so I think this must be the inner flower bed of the quiet garden. The ridge in the middle foreground is the inside border of the path, and the blubell ridge is closest to us — all of this is in the top right quadrant of the plan. On the right-hand border of this picture is the George Fox memorial stone.

Earlier in the day, the girders used yesterday to bound the concrete were removed, now that the concrete has set, and redeployed on other to-be-concreted areas of the playground.

The orange tubing, seen in a coil under the tree, was cut into short lengths and then each of these is planted round the Border of the concrete surface. Here's a ground-level picture. I don't quite understand this. I assume the tubing is to allow water to drain, or to allow the earth under the concrete to 'breathe'. But if that's true, wouldn't it make more sense to put it near the centre of the concreted area, rather than round the border where draining and breathing is less constrained?