Walls are always optimal for everything.

[Except they really aren't, but at least for writing they work pretty damn well.]

If you're asking me to transmute a bunch of leaves into a notebook or change a rock into a chalkboard, sure. But you need to gather up the leaves or rocks for me.

[He sighs, draping an arm over his forehead.]

I'm so tired, I don't think I could bear the physical labor required.