How many continuous dimensions you could reasonably represent visually? I think 8 (3 space, 1 size like sphere radius, 3-color space, time)
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Infinite since color actually is infinitely dimensional. :D And doesn't space+time give you size?
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note that I'm assuming "reasonably" to mean "constrained by natural ergonomic limitations of human user"
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depends on whether representation is of points in space, or of a continuous space. It is possible to get creative with glyphs and SPLOM
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color is not very efficient and can reasonably work for approximately 1 dimension
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glyphs can vary in size, orientation, color, opacity, so you get dimensionality of SPLOM + 5 other dimensions, not counting categorical
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it depends if seen in 2 or 3D. The 3rd dimension is usually impossible to interpret on a 2D surface. 3 colors is also hard... #dataviz
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I think you can only reasonably get one dim out of color, maybe two if you want people to spend a lot of time decomposing that
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