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It looks like dirty glass canister, on which on top have been placed transparent plastic lid. And that canister have been submerged in water. May be in some koi pool or smth.
Because this is 4chan, presumably in that canister were placed one figurine, which was covered with cum/semen over time. But for some reason guy got bored, and decided to not fill it full with semen, but "accelerate plan" and to place it in water as described before.
