Note: This information was taken from TSR's original AD&D adventure, the Temple of Elemental Evil.
For the players: This place is filled with cabinets, lined with shelves, and even the walls have many alcoves and niches. All bear sculptures of ceramic, bone, stone, shell, and other material. These figures depict mushrooms of all sorts -- toadstool, fungus, blight, etc. -- in all colors, sizes, and shapes. Some dozen or so larger sculptures are made of ivory, inlaid with translucent materials, and stand on the floor, apparently for use as stools by those who wish to rest while viewing the gallery's offerings.

For the DM: The thirteen stools are shriekers, enchanted to appear inanimate. If touched, a stool changes to its actual form and wails loudly; this brings Zuggtmoy if she is able to enter the room, or else alerts her as to the intruders' location.

Shriekers (13 stools): AC 7, MV 1", HD 3,
hp 20 each, #AT 0, SD noise; XP 95 each (x13)

If 10 man-turns are spent examining the various sculptures, eight valuable ones are found (worth 200-800 gp each). Four others radiate magic but have no other apparent worth; if thrown down, each changes (permanently) into a normal shrieker.