I want to have an encounter where the party is chasing a baddie is a shifting maze of mirrors (actually polished steel walls lit by a bunch of lanterns). Has anybody done this type of encounter before? If so, did you have a simple set of rules for negotiating the maze/discerning the correct target among the images, things like that, or did you map everything out to the smallest detail? Any suggestions welcome, even if they're just off the top of your head...