NATURE OF THE TIME SENSE.--How we perceive time is not so well
understood as our perception of space. It is evident, however, that our
idea of time is simpler than our idea of space--it has less of content,
less that we can describe. Probably the most fundamental part of our
idea of time is _progression_, or change, without which it is difficult
to think of time at all. The question then becomes, how do we perceive
change, or succession?
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