In the performing arts, a group of individuals can imitate something they could never do on their own; Think of the shadow dancers who are able to create the illusion of being an elephant or a plane, just with their coordinating bodies.

People can manipulate the shape of trees. They can plant them in certain patterns, but controlling the speed of their growth is getting quite difficult. The choreography of the trees requires a planting scheme spread over several years.

But, maybe the house was abandoned, long before the trees appeared. Perhaps they have appeared, on their very own. And are imitating.