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Cartesian Two Form

A Cartesian two form is a set of tubes. You can picture these tubes as being constructed by the intersection of two one forms. For example let's take one forms in the x and y directions each with spacing one. This results in tubes in the z direction with cross sectional area one. Notice that in vector form the vector points in the direction a fluid would flow in the tubes. This makes it easy to see how flux flows through these tubes.