Isolation generally refers to mass-on-spring techniques but can also be magnetic levitation, filament suspensions, roller bearing assemblies, negative stiffness, I.e., any technique that attempts to decouple the component from the room structure and the seismic I.e., low frequency vibrations that would otherwise be transferred to the component. Since there are six, count em, directions of motion for seismic vibrations, including three rotational directions, cleverness of design of the isolating system has its rewards. Even a thick granite slab has some benefit for isolation inasmuch as its inherent stiffness resists rotational forces. The Townshend Seismic Sink was one of the very first audiophile isolation devices, the Big Bang as it were was the Vibraplane Stand circa 1996 and Shannon Dickson’s landmark article in Stereophile magazine 1996 on the dodgy subject of vibration isolation, "Bad Vibes."