Berkeley and abstract ideas
Reading Berkeley’s A Treatise Concerning the Principles of Human Knowledge I was struck that his thought of abstract ideas, of which he seems none too fond so far, is what we now depend on for a good part of our lives: icons. Here’s his definition of abstraction, more or less:
For example, the mind having observed that Peter, James, and John resemble each other in certain common agreements of shape and other qualities, leaves out of the complex or compounded idea it has of Peter, James, and any other particular man, that which is peculiar to each, retaining only what is common to all, and so makes an abstract idea wherein all the particulars equally partake- abstracting entirely from and cutting off all those circumstances and differences which might determine it to any particular existence. And after this manner it is said we come by the abstract idea of man, or, if you please, humanity, or human nature…
Look at the icons on your computer screen. Somewhere there is an icon of a person, and the more universal the icon — black and white and having no gender — the closer it comes to what Berkeley is taking about. Look at the old Mac icons here, and you can see where those ultimately generic abstract ideas have been made to stand in for all things under that definition — all documents are one-page documents with lines of type. Tellingly, the icons with the most particular features are those of the Mac itself, which I’m sure we owe to marketing.
I’m not through with the part of Berkeley I’m reading yet, but he seems to be headed in the same direction as Locke, in that he sees such abstractions as not real. The abstract idea of man is not any man in particular. The man exists, but the abstraction does not. Berkeley seems to be going further to say that these general ideas are the cause of some of our problems. That by thinking and speaking of that generality we confound ourselves because that generality does not exist — there is no there there. That we — as I am fond of saying — think we’re so smart we think ourselves up our own asses.

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