For me, there seems to be a wall between me and everything in the world. They come in all kinds, some are thin and some are thick, some are tall and some are short. The thin ones will break if you poke them, and they will fall if you touch them. The thick one stood there, motionless. The tall ones can't see beyond at a glance, but the short ones can just stretch their legs and step over.
It's just random talk, don't worry about it, just enjoy it.
Purpose: Self-salvation for autistic patients