ABSTRACT
Several times each day, except perhaps when on vacation, most of us glance at calendars and clocks. We use the information obtained to organize our conduct. If we note it is only two days until our spouse's birthday, we may go shopping for a gift; if we note it is only fifteen minutes before the convening of the departmental meeting, we may scribble a note or two in preparation for the meeting. Despite the fact that we routinely use the information obtained from timekeeping devices to structure our actions, we seldom give the artifacts that display temporal information or the information itself a second thought. The information provided by calendars and clocks is part of our taken-for-granted world.
