Compartmentalization has become an essential part of modern living. The biggest separation is between work and play. We keep what we do for pleasure separate from what we do for survival. Our pleasure activities are often undertaken at a financial expense, while our productive activities typically aren't pleasurable. Creative activities, like painting or writing poems, typically count for a loss, financially speaking. But even in the modern day, we don't necessarily have to divide our creativity and our survival. The Hand-Sculpted House by Ianto Evans is one guide to combining the two. 
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