In your warehouse you use your knife to create. You keep old pieces of wood in your warehouse, and you use your knife to carve them into new things that only you could create.
When you create it's good for your soul (そう). It's so freeing, in fact, that when you get really into your creating, sometimes you'd swear your soul was floating a little bit outside of your body. But every time you notice, it sinks back down. Hmm.