Solid Figure for Triple Integral Practice

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This is a model of the solid region defined by *y*^2 < *z* < 9-(*x*^2+*y*^2) It's great practice for students studying multivariable calculus to think about how one would set up integration bounds for such a solid. In particular, cross-sections are not easy to visualize and there are no planar faces. To interface with a physical vertical *z*-axis, you have the option of having a hole down the middle. This model was designed as part of the [Manipulative Calculus](http://www.manipulativecalculus.com) project at Harvard University.