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Chapter 19. Creating Advanced ColdFusion... > Persistence and Constructors

Persistence and Constructors

Plato's theory of forms speaks of how the reality of a thing is distinct from the physical manifestation of it. There is, for example, a notion of a cup—a container from which one may drink liquid. Without being told anything else, you probably already have a “mental image” of a cup. Does it have a handle of some sort? Is it made from glass or clay? Is it decorated with stripes or is it a solid color? It doesn't matter! You are still picturing a cup.

Next, imagine that you are brought to a table on which are placed a number of common items—a hat, a book, some coins, and a cup. I would guess that, without regard to size, color, material, or the presence or absence of a handle, you would not have too much trouble identifying which object is the cup. How is it that you could make that identification when you didn't really know the details of the cup for which you were looking? According to Plato, it's because the notion of “cup” is the reality—not the individual, physical occurrences of each and every cup. There is such a thing as “cupness,” which is shared by all the different cups that are and ever have been.


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