Parker glances that way out of the corner of her eye, and says in a low voice, "Sometimes. Or maybe it's an illusion. I tend to avoid the books that aren't staying put. Why take chances?"

She straightens up, and re-folds the map. "Okay. This way, back into the orange."

The bookcases are now alternating wood and metal-- some gold, some brass, some a mish-mash design. They open back out, and the lamps are brighter, and Parker stops in front of a bookcase with books chained down. "These books tend to both bite, and explode. The notes say they're alarmed, too, so it's probably not a good idea to take them off the shelf. Dr. Pierson has some metal gauntlets in case we need to check them."