| This was an extremely entertaining account of how Mel, the water
beetle, wanted to surf on the ripples created by a rock thrown into her
pond, and needed to find the gradient for the best surfing. |
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| This was a nice model of the surface z=4xy-x4-y4-1,
with work to examine its extrema and saddle point. |
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| This was an excellent examination of a hyperboloid of one sheet (made
out of a couple of truncated premade styrofoam bells) via its level curves
to determine te parameters of its equation. |
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| This was a deluxe version of the surface z=sin(sqrt(x2+y2))
along with coordinate planes, scaled axes, and a moveable tangent plane. |
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| This was an impressive fold-out display showing the level curves of
the paraboloid z=x2+y2, along with tables and explanation. |
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