A Fore-Edge Painting Stayed Invisible until the Reader Bent the Book’s Pages｜書口畫平常消失，只有把整疊書頁彎開才突然現身
WHAT 這是什麼
The Met demonstrates a disappearing fore-edge painting hidden along the edges of a book's pages. When the closed book is viewed normally the image is concealed; gently fanning or bending the page block reveals the painted scene.
WHY HERE 為什麼屬於底域的世界
圖像被設計成必須靠讀者改變書的形狀才能看見；觀看不是被動的，手的動作直接控制畫面存在與消失。
BLIND SPOT 補了哪一塊少看的視角
並非所有 fore-edge paintings 都採同一隱藏機制，也不應為了觀看而強行彎折脆弱古籍；本條描述的是特定技法與館藏示範。
