Saturday, December 5, 2009

Homemade Disco Ball

You decide to make a disco ball at home and surprise everyone at the holiday party. You take an old globe, cement glue and you are heading for a dump to find an old mirror that you can break into little pieces. What size and shape mirror you should look for?

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Kim said...

If you're going to break the mirror into pieces, it doesn't matter what shape it is. You just care about covering the surface area of the globe, which is 4*pi*r^2. Which is approximately

As an example, then if it were to be a square mirror, you'd need one with sides approximately 3.5r

Maria said...

Right on, Kim!
The shape does not matter but the size should be at least the surface of the ball.
Take a look at the beautiful disco balls in the window of the Men's Warehouse in Manhattan. Some of them are not even balls.

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