Interactive conducting at Royal Festival Hall

I stumbled on this interactive installation in the foyer of the Royal Festival Hall. Your left hand controls the pan and volume of the music, your right is meant to follow the timing line (close up in 3rd pic)Very nice idea but…it just didn’t work properly. The lag between moving your hand and the reaction of the installation was a good 3-5 seconds. Will try and find out what controller they used…

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