Building an Igloo 

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Courtesy of W.W. Norton & Company
Ensure that the tops of all blocks angle inward
Courtesy of W.W. Norton & Company
Miter the ends of the blocks for a tight fit
Courtesy of W.W. Norton & Company
Cut a ramp in the blocks that continues at least halfway around the circle
Courtesy of W.W. Norton & Company
Lines drawn along the slanting tops of all blocks should point to the center of the igloo
Courtesy of W.W. Norton & Company
The igloo grows as equally sized blocks are added along the spiral ramp
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Courtesy of W.W. Norton & Company
Ensure that the tops of all blocks angle inward

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