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a system that is composed of components (i.e., modules) that can be fitted together or arranged in a variety of ways. - So, it is not just about modules, it is mostly about the glue.

In the same way, Lisp without an underlying list structure is just a prefix notation.

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I was using the analogy of the composability of Unix tools as a role model for how to think about the segregation of roles in an object-oriented system. I agree with you that the ways in which we can couple these objects together through their interfaces is the core of what we're designing. I think this philosophy as an analogy (especially as outlined by ESR) is applicable to a wide variety of things beyond even programming. Interesting to think about, anyway. Thanks for your thoughts.

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