In that case very impressive Malcolm. The timing was just just coincidental causing almost a double bluff
Would the rims of the fan blades be clear then? I don't see how you would get them vertical enough for the LED's to show, they could raise slightly but would need to be fairly flat to gain any altitude.
There's a kids hover-coptor-frisbee thing available at the moment with proximity sensors and no controller but when used appears to remain very flat and stable reducing the visible profile when looking side on. I could imagine something like this with a light on the top visible from all angles rather than the fan blades.
No matter what, I love the way tech is rolling forward from a ball on a string.