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I'd also be interested in...
doing something like your idea of "if you're already a circle and you receive a circle signal you could turn into yet another shape". That is, I'd be interested in making a model in which the agent can change due to some influence from its environment. But can agents change in Net Logo? I don't think I've ever seen an agent change itself in any model so far... It would be really cool if we can do that though...