The improvised security system rigged to the entrance of this building alerts the (perhaps snoozing) door guard to the arrival of late-night entrants. An antique-looking bell is suspended in the corner of the sliding glass door. Along the top of the door, parallel to the bells, are taped several expired batteries. When the risk for sleep for the door guard seems imminent in the wee-hours, he will detach the bell from the length of string holding it away from the door, causing it to rest directly against the door. The course of the said door sliding open brings the batteries into contact with the bell, causing several clearly audible rings in succession.