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    I like all of it except the blue for “busy but available soon”. It’s too “opposite” to the red of “busy”. A friendlier variant on red would make more sense to me.. pink, magenta or a burnt orange, say (although this would require more delicate control of the RGB pins! :-))

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      So when you are in the room there is a red light hanging from the ceiling. As the end of the meeting gets closer and closer the red can blend into another color.