>>Yes but is the level in your hand while you are nailing? Or is it on the bench waiting until you need it?
>
>Ahh, I knew it! Well, here we go down the metaphor path:

But "metaphor path" is itself a metaphor path, as I see you're quite comfortable going down it, metaphorically speaking :).

As did the "self-defining term" itself, "metaphor path" became a self-defining term.