Yeah, I missed it.  Thanks.  The trap is non-magical, it is just an effect of the colored glass and the lights.  You figure that breaking a single crystal or vase will disrupt the effect and render it harmless.  Among the papers and books scattered about the room you find six scrolls scribed at CL20:  darkvision, greater magic weapon, hold person, lightning bolt, greater invisibility, and summon monster V.  There is also a desk to be examined, but I'll need specific actions for it.  And you find a concealed door behind a bookcase.