I strongly agree with Yemon that my first example about the octahedral example has nothing to do with visualization, it's purely asking how to render a diagram in LaTeX.

I actually went through the list of all the questions you tagged, and I have specific reasons for opposing the [visual-math] tag on each question on my list, and I think it's fine and appropriate on the complement! Perhaps you should try defending others from my list, Jose, so we can come to an agreement about the scope of the tag?

Incidentally, there are many questions tagged with [intuition], [big-picture], and [motivation] -- I think these tags are also needless and should be removed.

To continue my line of argument from above, suppose I post a question about the Moebius function of a finite (semi)lattice; would that get tagged with "visual-math" since one usually tries to get a handle on lattices through Hasse diagrams or similar? Even if I was merely asking for some asymptotic bound on a combinatorial convolution-type sum?

I guess my problem is that, as I see it, almost any question in mathematics can be thought of in visual terms, at least in part, since that seems to exploit a well-evolved part of our neurological setup/training. Should I start tagging functional-analysis questions with "visual-math" just because I'm thinking about block bases or "compact operators squashing regions" or "isometries" moving "mass" far away? How about probability questions where people are thinking of a Brownian motion meandering its way out of a given region?

I just fear that as conceived, the tag just applies too broadly, and if it is to stay it should really be used for questions specifically asking for aids to visualization.

http://mathoverflow.net/questions/24737/the-upper-hat-of-an-octahedral-diagram-in-latex
http://mathoverflow.net/questions/25983/intuitive-crutches-for-higher-dimensional-thinking
http://mathoverflow.net/questions/26939/geometric-imagination-of-differential-forms
http://mathoverflow.net/questions/24453/how-does-singular-homology-h-n-capture-the-number-of-n-dimensional-holes-in-a-s
http://mathoverflow.net/questions/21424/how-to-draw-knots-with-latex
http://mathoverflow.net/questions/21024/what-is-the-exterior-derivative-intuitively
http://mathoverflow.net/questions/20847/why-are-the-dynkin-diagrams-e6-e7-and-e8-always-drawn-the-way-they-are-drawn
http://mathoverflow.net/questions/18758/drawing-a-combinatorial-3-configuration-of-points-and-lines-with-pseudolines
http://mathoverflow.net/questions/15600/how-to-fill-a-simplex-with-almost-disjoint-cuboids
http://mathoverflow.net/questions/17635/drawing-3-configurations-of-points-and-lines-with-straight-lines
http://mathoverflow.net/questions/15322/visualizing-whats-going-on-in-based-homotopy-theory-et-al
http://mathoverflow.net/questions/11743/database-of-polyhedra
http://mathoverflow.net/questions/9991/how-can-i-sample-uniformly-from-a-surface
http://mathoverflow.net/questions/7859/how-to-teach-addition-of-negative-numbers-closed
http://mathoverflow.net/questions/6810/seifert-surfaces-of-torus-knots
http://mathoverflow.net/questions/5936/whats-so-great-about-blackboards-closed
http://mathoverflow.net/questions/5133/how-to-present-overlap-of-related-sets-closed
http://mathoverflow.net/questions/2692/matrices-into-path-algebras
http://mathoverflow.net/questions/1977/why-is-the-gradient-normal
http://mathoverflow.net/questions/1194/how-to-partition-r3-into-pairwise-non-parallel-lines

This is so extensive that my preferred option would just be to merge [visual-math] into [tag-removed], unless we can convince Jose to roll these back himself.