definetely drumkit

Either an ancient Mayan artefact, or, an overgrown drum set.

I've seen it before in pictures of satellites, but what actually are all those spiky blocks, and what do they do?
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Sound proofing... every sound recording studio I've been in is covered in it. It stop sound waves from bouncing back off the wall. Though they may be using it to stop different kinds of waves... I'm sure it's for the same effect, to stop cancellation effect of doubling waves.