Human: Write a detailed description of a magical scene inside of a medieval library with an onyx pedestal, archway, and a sign on the wall. Assistant: 
Deep, azure glaes has been crafted to resemble the flowing cascades of a waterfall in miniature. The artful sculpture resides within a small nook hung with phosphorescent moss that casts a mysterious glow upon the volcanic glass. A dark stairway stands in the corner of the hall.