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After playing with a few ideas I ended up focusing on the interaction between character and environment and the irony of home and less on the habitat as a direct reflection of personality but rather a corollary to aspects of the character's life. So here we have a girl from a quite well to do home, but it's just a cold empty place. Rather than eat the only things in the fridge, crackers and peanut butter, she makes a house out of them.