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Public Farm 1 calls for a sun shelter constructed as a butterfly roof of linked planters, a container garden in the air. Intended to be a working farm, the structure is an effort “to create a neighborhood-based ecological infrastructure,” said principal Dan Wood. Heavy-duty cardboard tubes, some as wide as yard in diameter, will be bolted together to form the pavilion. Some will be filled with plants, and some will allow light through; others will contain sound equipment or be carved out to create quiet alcoves.