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True. Personally I have 3 LEDs on my keyboard that I use to show the current layer (in binary). I then carefully numbered my layers so that I use 0, 1, 2, and 4 in preference to others ;)

That’s an interesting idea, actually. A keyboard that could visually identify state might be useful for education: say a typing or Vim tutor. It’d be kind of nifty if a key started flashing so that you could identify its location (for learning a layout), or had a little icon suggesting “insert” or whatever command it triggers. T’would be an expensive teaching tool, though.

Art.lebedev had full-size keyboards, as well as smaller pads with 3, 6 or 15 keys.