ABSTRACT

The Nameless is the origin of heaven and earth; the Named is the mother of all things.

Lao Tzu

I hate definitions.

Benjamin Disraeli (Vivian Gray)

No two sensory events are exactly the same. We never see the same moon twice; even our wife’s or husband’s face exhibits subtle changes in expression from one viewing to another. Yet most of us manage to ascribe to the sensory world a fair degree of regularity. How do we decide when two sensory objects are similar enough to be listed in the same category and when they are not?