Visualizing Hyperboloids

This animation represents level surfaces of the function f(x,y,z) = x^2 +y^2 -z^2. The graph of this function is a 3-dimensional solid in a 4-dimensional space - a hypersurface!


This video, the Visualizing a surface of revolution and cylinder surface didn't actually post. None of those videos can be watched on here for some reason?
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