yeh well... i think it was more the case that they wasnt sure what was going to happen. It was basically this madly long tube which stretched accross the whole of the stage...
It was more of an experiment than a demonstration actually.. well they played some music along with it... because apparently Infrasound afeects people at different freqs. You basically had to put your hand up if you could feel something and write what exactly you was feeling.... At first when they switched it on they thought it wasnt working... and you couldnt really feel much... so they went up a few freqs and you could feel something was going on but you couldnt hear it and you couldnt really feel it either... you just knew something was going on...
but yeh... they went from like 3hz... up to like 20hz or something...










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