Everything in creation is classified in one of four orders; inanimate (mineral), plant, animal and mankind. Mankind is the pinnacle of creation. The inanimate, which has no life in it, is the lowest of the four orders.
This is the reality within the paradigm of creation and world order. But in their spiritual origin the inanimate, which appears to be the lowest, derives from the deepest source.
The Mishkan was a temporary dwelling place of the Shechina and reflected the paradigm of creation. And so the plant and animal material were primary. The inanimate was relegated to the floor.
In the Beis Hamikdosh the essential truth of reality was revealed, the way things exits in the source. This is similar to the experience in the Messianic era. And so, the Beis Hamikdosh was constructed of stone (the inanimate).
The four orders exist within the levels of our soul. Our emotions are like plants that grow and are dynamic. The inanimate are our actions which seem simplistic compared to the vitality of feeling and understanding.
Action may seem like the lowest of our expressions, but its source is the loftiest and it is of most consequence. This is the power of the act of a Mitzvah, which achieves more than any meditation can.