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Californians love the sun, and their houses show it. The old ranch houses of California copied the mission style. In the centre of the house was an open place, or "patio", with buildings on two or three sides. Californians liked the patio. They liked to live half inside and half outside. New houses today often have patios. People work, cook, sunbathe and talk to their friends on the patio. New modern houses all over the United States have copied the idea of the Californian patio. Some Californian ideas are not so easy to copy. Go up in an airplane, and look down at Los Angeles or San Diego. What are all those blue things next to the houses? That’s right. They’re swimming pools. Not many people outside California can pay for their own swimming pool in their own backyard.