Because computers have ...

Because computers have memories, we imagine that they must be something like our human memories, but that is simply not true. Computer memories work in a manner alien to human memories. My memory lets me recognize the faces of my friends, whereas my own computer never even recognizes me. My computer's memory stores a million phone numbers with perfect accuracy, but I have to stop and think to recall my own.
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 Alan Cooper

Quotes from the same author

Keep it simple: In general, interfaces should use simple geometric forms, minimal contours, and a restricted color palette comprised primarily of less-saturated or neutral colors balanced with a few high contrast accent colors that emphasize important information. Typography should not vary widely in an interface.
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 Alan Cooper
Usability methods are like sandpapering a chair. If you are making a chair, the sandpaper can make it smoother. But no amount of sandpaper will turn a chair into a table.
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 Alan Cooper
Computers no longer interface with humans--they interact, and the interaction will become steadily deeper, more subtle, and more crucial to our collective sanity and ultimate survival.
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 Alan Cooper