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How: superquadrics

And I do that by using superquadrics, which are this tunable two-dimensional space of shapes shown here- see the paper for the details.

Superquadrics were introduced to computer graphics by Barr in his 1981 CG+A paper. And they have been used in visualization before, in both an information visualization and a scientific visualization context. Shaw et al. measured the perceptual ability to discriminate these shapes, and used them to both represent properties of individual documents in a large corpus, and also the values in a magnetohydrodynamic flow simulation.

So, like that work, I'm going to be using this variable glyph geometry to represent values, but the contribution of this paper is to use the glyph to represent the degrees of freedom in tensor values.