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What do you mean you can't copyright a drawing of a prism? Every drawing you make is automatically copyrighted. https://en.wikipedia.org/wiki/Copyright_law_of_the_United_States#Works_subject_to_copyright_law
I think you're confused. Just because it is similar does not mean it is the same. This is not the album with the letters on top. They look different.
I'm saying that while any specific drawing of a prism is protected by copyright, the general concept isn't. Drawing a prism, even one that looks almost identical to the one on the album cover, is not restricted. (I'm not sure we actually disagree.)
Yeah, OP just said some weird stuff.