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Time is what clocks measure. The three key features of time are that it orders events in the sense of placing events in sequence one after the other; it specifies how long any event lasts; and it specifies when events occur. Yet despite 2,500 years of investigating time, many issues about it are unresolved.
First published Mon Aug 28, 2000; substantive revision Tue Nov 17, 2009 We see colours, hear sounds and feel textures. Some aspects of the world, it seems, are perceived through a particular sense. Others, like shape, are perceived through more than one sense. But what sense or senses do we use when perceiving time?