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Avinash_Tyagi said:
JaggedSac said:

I am going to disagree and say that your definition fits firmly in the economical want category.  No one knew they wanted a Wii Fit until the Wii Fit was created.  There was never a need for people to be able to stand on a board and interact with a television set.

Except there is, its called the fitness market, fitness devices and videos show that there is a need

Ok, so you have defined at least one need for Natal.  And it has the capability to satisfy that need greater than any other comparable device on the market.