Depict density in a 2D region by a height map in 3D, either a physical sculpture, probably 3D printed, or in virtual 3D. This ends up making volume represent quantity (integral of density), which is nice.
Modify the density while preserving volume to avoid topographic basins, low density regions completely surrounded (and thus obscured if not looking from above) by higher density regions. More generally, assume a light source that is limited to within a certain angle from horizontal. Avoid permanently shadowed regions.
Inspired by a density map of the population. The shades of gray do not have enough dynamic range.
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