《晋书·列传·第三章》
王恺用紫丝布做了四十里长的屏幕，石崇用锦做五十里屏幕与之匹敌。
恺作紫丝布步障四十里，崇作锦步障五十里以敌之。
Wang Kai made a screen with purple silk that was forty li long, and Shi Chong made a screen with brocade that was fifty li long to compete with him.