In "Ochikubo monogatari" (The Tale of Ochikubo) established in 979, there are descriptions such as 'When you open the shoji as a separators and go out, the closed mind is less than secure' and 'shoji as a separator is opened,' therefore, 'shoji as a separator' can be interrupted as Fusuma Shoji.
九七九年成立の『落窪物語』に「隔ての障子をあけて出づれば、閉すべき心もおぼつかず」「中隔ての障子をあけ給ふに」などとあるから、へだての障子は襖障子と解釈できる。