The Question and Answer section for The Glass Castle is a great resource to ask questions, find answers, and discuss the novel.
Like the Glass Castle, a good life in New York City is difficult to obtain. People go there with dreams but they are fragile and seemingly unattainable. New York is one of the most expensive cities in the world and very difficult to succeed in.
What was the painting of? I don't quite recall it.
I think the whole story is a balance between turbulence and order. Rex describes this concept of physics after Brian and Jeannette almost die in a fire they set while playing with toxic waste. He warns them that no rules exist in the Boundary...