# Differences

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props:start 2016/09/29 12:39 props:start 2018/07/26 13:30 current
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==== Pumpkin Quarters ==== ==== Pumpkin Quarters ====
-A pumpkin that has been sectioned into quarters can be used as an interactive physical representation of a spherical coordinate system+A pumpkin that has been sectioned into quarters can be used as an interactive physical representation of a spherical coordinate system.
{{props:pumpkinquarter.jpg?250|pumpkinquarter}} {{props:pumpkinquarter.jpg?250|pumpkinquarter}}
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{{props:pineapplesections.jpg?250|pineapplesections}} {{props:pineapplesections.jpg?250|pineapplesections}}
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+==== Surfaces ====
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+We use plastic surfaces of multivariable functions that are dry-erasable, transparent, and lightweight. The surfaces were created as part of the [[https://raisingcalculus.winona.edu/|Raising Calculus to the Surface]] and [[https://osuper.science.oregonstate.edu/content/raising-physics-surface|Raising Physics to the Surface]] projects. Surface Kits include a surface, its corresponding laminated contour map, and a slope measurement tool.
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+{{props:mathsurfaces3.png?250|Raising Calculus Red Surface}}
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+==== Contour Maps & Vector Maps ====
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+We print out contour maps or vector maps and put them in dry-erasable sleeves. Often, our maps correspond to plastic surfaces.
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+{{props:vectormap.jpg?250|Vector Map Example}}
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