Someone else mentioned that Isaac is from a logging town; I take this song to be about the fruitlessness of life there; the town lives to kill trees and kills trees to live; this pointlessness is the reason why their hearts aren't beating; they're living a sort of empty, half-life, or they're barely alive at all. They pour their blood into the ground (which I take to mean that they're putting their whole lives into sustaining the city), the trees soak it up, and then they cut down the trees; and I think the pointless of that act is also reflected in the carving, because the cat faces will be gone as soon as the tree is cut down.
Someone else mentioned that Isaac is from a logging town; I take this song to be about the fruitlessness of life there; the town lives to kill trees and kills trees to live; this pointlessness is the reason why their hearts aren't beating; they're living a sort of empty, half-life, or they're barely alive at all. They pour their blood into the ground (which I take to mean that they're putting their whole lives into sustaining the city), the trees soak it up, and then they cut down the trees; and I think the pointless of that act is also reflected in the carving, because the cat faces will be gone as soon as the tree is cut down.