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Visible silence

Nirvana's Nevermind features a hidden track called "Endless, Nameless" which follows the final listed track after 10 full minutes of silence. From certain angles, you can actually see this silence on the disc, since it reflects differently from the rest of the audio. The rainbow-y texture you see is the parts of the disc that are encoding either nothing, or nothing of value.

Technically, this "visible silence" should be present on any album with a hidden track, but Nevermind makes for the best example given the extraordinary length of it.

As an extra tidbit, this hidden track was accidentally omitted from initial printings of Nevermind on CD, and was never printed on vinyl releases of the record.