All right, so for next year I want to create a pathway that shakes like an gaint earthquake. (Got the idea from the movie 2012 not Japan's diaster, just putting that out there) Anyway, I want it to be where there are walls and a roof. So like a long corridor or something. and then the walls and roof start shaking, which would be pneumatically driven, but I also want the floor to shake too. So, obviously the platform will be at min. 1/2 a foot of elevation. So what do i use to make the floor, metal, steel, what do i use to make the floor shake and/or shift, hydraulics, a motor? something that can do the job without giving in wall doing it. So any suggestions?