What is a good way to make a model black hole?

What is a good way to make a model black hole?

Im doing mine for school, and i made it i plasticine and the materials to make a cast, was there a better way? ( i need to roll marbles on it )

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Blueravenfeather
make it like a cone shape so the marbles would roll into it. if you wanted something like the picture you could make it out of cardboard and paint it and put a stand under it i love paint. it doesnt taste good though.
on February 05, 2015
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