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Categorizing Art Style
I'm not talking about some concrete categories, I'm thinking more in the direction of a crowd-sourced distance matrix on author (less data) or book (more data) level. When complete, this would make finding manga with similar art style trivial.
Critique
Does this even make sense? How would a user define a similar art style? It may devolve into a distance based on tags. Therefore if at all, a distance matrix based on authors makes the most sense.
This would require huge amounts of user input. The work associated with tagging manga grows linearly with their number, the amount of work needed to maintain a distance matrix grows polynomially. It would never be complete.
Authors' art style changes. The problem with building the distance matrix on author level, is that the art styles of authors can change with time.