It is said that a noble of ancient Rome watching an event in the Colisseum, the father of all modern stadiums, ordered his slaves to raise something akin to a rain tent over him to keep out the elements. The result was an egg-shaped structure.
據說在古羅馬帝國時期，有一位貴族在競技場看表演時，為了防曬及下雨，曾命令奴隸拉起一個類似雨篷的帆布，形成天幕，形狀宛若一個「蛋」。