Foundation, Cornerstone
There’s a stone, a tree, another tree, and a coat rack. That stone and two trees will make the perfect foundation, or cornerstone, for a house to put that coat rack in! This stone is flat and heavy and both of the trees are flexible and durable.
Imagine making a foundation with the stone and the two trees so you’ll have a place for your coat rack. Feel the wood grain and cold stone against your skin as you move them around to form the foundation.
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After you finish the foundation, the only step that's left is to wash the entire thing with soap (そ).
Imagine getting on your hands and knees, rubbing a bar of soap all over the foundation you built. The soap gets into all the nooks and crannies in the wood and stone. Now if a coat falls off the coat rack onto the floor, you just add water and poof! Clean!