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Message: [QUOTE="vruz, post: 4463416"] I can't decide if it's just the example or the whole section, but this I see what you mean, and I agree with you about that particular section. ( also, it's especially noted in the title that is not a specific Ruby idiom.) I believe that this pattern may well be domain-specific to a certain technique of graphics rendering, and that's probably not the best place to put that piece of code. (but it's a wiki, you know...) wrt that specific section, I would also argue that I can barely see the need for abstract classes like that in any Ruby code. Thank you for the recommendation. cheers, vruz [/QUOTE]