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This paper is a position paper on the concepts of emergence and individual / collective paradox, from both philosophical and experimental point of view. It presents successively: (1) some sociological and philosophical issues related to collective emergent behaviors; (2) a non-conventional point of view of physical mass-interaction modeling as a cellular automata system; (3) a proposition of a generic physical mass-interaction model for emergent collective phenomena able to render the main expected figures of non-deliberative emergent collective phenomena as those that define crowd behaviors