Why is it that all GraphicalUserInterface''''''s seem to be based on idea that software should resemble paper?

Pro:

	* It gives you a lower LearningCurve, at least at first.

Con:

	* Functionality that is not part of paper injures the metaphor severely, and it usually shows.

TedNelson often rails against the WorldWideWeb just being a bad simulation of paper, when he feels his XanaduProject had much more to offer.

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CategoryMetaphor
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Because the light text on dark background standard of earlier pre-GUI software doesn't feel like staring into a lightbulb for hours on end.  It's a conspiracy by eyedoctors and eyeglass salesmen.