An idea for sorting

I'm trying to sort my watches according to the enjoyment I get from them and I identified three main dimensions:

  • Formality (how well a watch goes with a suit)

  • Functionality (what the watch can do and how much it can endure)

  • Sentimentality (old valuable mechanical watches are more endearing than new cheap quartz)

I wonder what tools for plotting the 3D graph to use, and more importantly how to set the scales.

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Nerd! (and I say that with the utmost of respect)