Resources are not physical either...hence the lack of stacking. I think this came up somewhere too.
Items, I'm not sure.
It doesn't follow from both being nonphysical that creatures can strengthen resource presence...there has to be another justification. Grasan attitude does indeed cause one to have a good sense of the..."ferment" and "dried skin" of the world.
Similarly you would have to justify a creature being able to directly help to create an item. Attitudes can lead to "items" but usually it's not direct, but rather facilitated by experience, input..."heat," I guess.
From Ivorak:
Since posting this idea in that thread, I've come to wonder why the drachorns specifically get represent in a scene, and the tiny men...Right now it seems to me like the "chained-down drachorn, held by tiny men" is indeed a part of everyone's heart, and a very important one. And even though finding a reason to harness the drachorn attitude can come from unleashing the drach, there is still always one that's tied down in the lair.
Similarly, there is always an untouched angien egg, even when we find a reason to harness the attitude of the hatched angien.