Because the past days, according to research.
the best comfortable ratio of viewing the screen.
the aspect ratio is 4 by 3 <b>rectangular</b> screen.

i saw david letterman in it...
lolx

antics are nice

i wonder do they come in plasma or LCD

ur brain cant no see carefully when screen square or regtangle.
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haha

when man was designing the computer monitor, he designed it as oval. Somewhat like the horizontal oval of the human face. Then woman walked by and asked, "Why does it have to be oval?"

Man thought to himself and couldn't answer the question. So he went to build the rectangular monitor and that silenced woman. But never did Man expect that centuries later, apes would question it.

but really, i'm not sure if it is possible to engineer a pixel that is of any other shape than square, and humans prefer wide-screen to "tall-screen" and thus the rectangular monitor.