The tent is made from three layers of ETFE, a special see-through plastic that allows daylight to wash the interiors while sheltering them from weather extremes. Air is pumped in between the layers inflating them into enormous pillows, giving the tent covering the appearance of a large quilt. In winter, a key challenge is to prevent the formation of ice on the inside of the tent using temperature control and directing warm air currents up the inner fabric surface.
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