Interesting to have a read of this - having had my first ballroom dance lesson recently (Social Foxtrot, Chachacha, some salsa to end). Whilst the best may yet be to come (Rumba, Argentian tango...) it was interesting to be throw into it - learning a start of a new pattern prior to even knowing the basic steps of the social Foxtrot.
I know that my partner commented that I kept on looking blank, and staring down at the floor -
A sign sometimes of heavy concentration and trying to visualise/go over the steps.
My thoughts also go back to getting Jules of LightStage fame hooked on salsa, so we could get some salsa done in one.
It would be a great visualisation tool.
Movement sensors, ultrasound emitters - all possible to be used: http://www.newscientist.com/article/dn12963
Can't find the information.