In fact, the fundamental design criterion for any chair is the size and shape of the human body. There must be roughly twenty-one inches between the arms. The seat must be about eighteen inches above the floor and depending upon the chair’s use, be canted downward at a pitch between 5 and 7 degrees. If used for dining, chair arms must fit under a standard thirty-inch table-top. And when complete, the whole object must be light enough to be easily moved.

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