"a" would suggest that there was more than one. True for Picasso, not for Frankenstein. Besides, only Picasso can make "a Picasso". Everything else would be fake and plagiarism.
replyOnly Rube Goldberg can make a Rube Goldberg machine?
reply"Machine" is the keyword here. Just like you'd say "a Frankenstein monster", not "a Frankenstein".
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