Playing Music by Touching Spinning Glass Bowls with Wet Fingers｜富蘭克林把一排玻璃碗轉起來，手指碰邊緣就成樂器
WHAT 這是什麼
史密森介紹班傑明・富蘭克林的玻璃琴：調好音的玻璃碗套在水平軸上，由腳踏機構旋轉。演奏者以濕潤手指接觸碗緣，使多個音高發聲。
WHY HERE 為什麼屬於底域的世界
玻璃杯原本靠敲擊或摩擦發聲，這裡整組被機械化旋轉；人的濕手指成了樂器與透明材料之間最直接的接口。
BLIND SPOT 補了哪一塊少看的視角
Franklin did not invent the phenomenon of musical glasses itself; his contribution was a new instrument arrangement. Later health fears around the instrument were historical claims, not established material effects.
