Here's one I've been struggling with lately: Parallel coordinates representations of smooth hypersurfaces. I'm not aware of extensive reseach of the parallel co

Here's one I've been struggling with lately: Parallel coordinates representations of smooth hypersurfaces. I'm not aware of extensive reseach of the parallel coordinates geometry prior to 50 years ago. http://www.cs.usc.edu/assets/004/83248.pdf http://www.cs.usc.edu/assets/004/83248.pdf