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a building's eyebrow, raised against the sun since Roman emperors demanded shade over the Colosseum
roman techgiant velarium awnings shaded 50,000 Colosseum spectators
sailor laborRoman navy crews rigged those massive cloth roofs
word rootorigin unknown, possibly French auvent for sloping roof
storefront gold19th-century cities used them as walkable advertising
retractable eraspring-loaded arms appeared in the late 1800s