I think this image - and Snails's description - speak for themselves.

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Holo Norn by Snails

"A hologram of a norn that had mass to it. It's function would be to lend a helping hand in norn care as well as teaching and learning, acting as a super learning computer with AI. Also, due to it's appearance norns are more likely to trust it. Usually only higher class shee could afford them, due to the fact that it was costly to keep them up and running with out something going wrong. In rare cases, holo norn's AI would get corrupted, resulting in them doing something completely wrong; from trying to teach the same word over and over again to destroying ecosystems or even killing other creatures. If a holo norn device is found it is advised that you check for any oddities before running it."