How would I make a curved edge when making the structure of a paper mache sculpture?

heyy =]

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I'm making a sculpture of a ps3 with paper mache.
http://www.letsgomobile.org/images/news/sony/sony_playstation3.jpg

As you can see the top is curved. I am VERY new to making sculptures, so how would I make that top curved edge?
 
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