Considering that the set-in Shoji (fukushoji, or set-in translucent screens) and the sliding Shoji were invented almost at the same time, apparently there were sliding Fusuma as a part of residence of upper class until the establishment of "Taketori Monogatari."
嵌め込み式の障子（副障子）と引き違いの障子とは、ほぼ同時期の発明と考えると、『竹取物語』の成立時にはすでに一部の上流階級の邸宅には、引き違いの襖があった事になる。