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I have recently released the jruby_art-1.1.1.gem, that provides a ruby wrapper (using jruby-126.96.36.199) around processing-3.1.1. So you can write processing sketches in ruby, including those using regular java libraries (eg Joshua Davis hype library and Frederik Vanhoutte HE_Mesh library). But there's more the jbox2d, geomerative and toxiclibs libraries are also available as ruby gems. Like vanilla processing there are huge number of worked examples, including those for Dan Shiffmans Nature of Code.