The older man pointed to debris—assorted refuse jettisoned from passing ground-cars or dropped by careless pedestrians—strewn along the walkway. “In the old days,” Seldon continued, “you would never see litter like this. The security officers were vigilant and municipal maintenance crews provided round-the-clock upkeep of all public areas. But, most important, no one would even think of dumping his trash in such a manner. Trantor was our home; we took pride in it.