From Discworld MUD Wiki
It appears as a gemmed volume.
A small, dancing lotus moves over the face of this majestic volume while lightning crackles along the spine and edges. A masterfully crafted book, it seems to almost dare you to open it. Gems line the spine of this tome and sparkle dangerously.
The dancing lotus leaves trails of octarine sparkles across the face of this volume as it moves.
This book can appear in any of the four tome locations inside the library.