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> Big spinny things are also hard to scale.

I worked for people that were making these kinds of things (in 2009-10[0]) for advertising (8ft high, 6ft diameter spinning cylinder[1]; 8ft high, 4ft wide flat display with 8 interconnected spinning discs) and yeah, they were absolutely terrifying. Especially the flat display - sounded like a jet taking off when starting up and wasn't much quieter at full pelt[2].

[0] I suspect these things are easier now with lower power LEDS, etc. given you can cover a cylinder in directly addressable LEDs pretty cheaply and don't need the massive spinning death machine.

[1] Deployed at a few places around the UK but now sadly removed.

[2] They were intended for roadside displays, not shopping malls.






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