For example, what if you know what something looks like, but don't know what it's called?
I picture an interface that involves fuzzy logic; one that would enable you to gradually circle in by choosing things like "kinda like this."
Such an interface could be helpful; for example, if you were searching your hard drive for an image, and although you knew what it looked like, you also knew the image title was something meaningless, like "img00345.jpg.
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