Literature Reference: 笔架霑窗雨，书签映隙曛。——《题柏大兄弟山居屋壁二首 二》 杜甫 The brush rack is dampened by the rain at the window, and the bookmarks reflect the twilight through the cracks. From 'Inscribed on the Wall of the Mountain Dwelling of Elder Brother Bai' by Du Fu.