What's under your amp?


Interested in hearing the importance (or not) of isolation platforms for amps. Check my system, you'll see I've got my Cary's sitting on top of my cabinet, which is a custom piece made of solid cherry. Very solid, but I'm wondering if maybe the cabinet is introducing vibrations up into the amps, and maybe I could use some help from a platform?
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The ROCK, I have 400kg rock from my garden, find it is fun for the amp and look great. My amp is too heavy one of custom build rack could not support, and I did not have budget to buy an expensive stand...so that "rock" kind of working out for my system.
Amthanh, that rocks! Pun intended. I actually prefer to put my stuff on slabs of maple whenever possible. What is under the cabinet? My situation is such that my listening room sits on a concrete slab.