Three suitcases, containing three distilled, concentrated characters of prior employees from the Division stand guard over three in-wall fire-alarm pulls.  The fire alarm pulls encode numeric values that activate the suitcases in different sequences - it is the lowest frequency sound in the space (i.e.: less that 20 Hz, high-amplitude vibration).

Left Luggage 2 was presented as part of Northern Electronics Research Division (see video here).  Special thanks to Donny Tsang and Derek Wang for photography and video.