People are measured by thinness and thickness, hardness and softness. For the purpose of this story, only the soft, thin ones matter. All motion comes from below. Anything felt by someone is felt by everyone.
Amy runs across the lawn, the lawn, thinks the reader, but it’s all girls running everywhere. OK, Amy is the protagonist, we think. But no. OK then I am the protagonist. But again, no.
The protagonist is the grass.