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The interaction between a peregrine falcon and a dove is visibly non-reciprocal. What happens to the well established framework of hydrodynamics and phase transitions in non-reciprocal systems far from equilibrium ? In this talk, I will first answer this question by looking at three archetypal topics in soft matter : active solids, flocking and interfacial dynamics. Simple demonstrations with robots will be presented along with naturally occurring phenomena from various domains of science that share a common feature : reciprocity has no reason to exist.
Next, I will discuss how to incorporate non-reciprocal individual preferences of decision-making organisms into a hydrodynamic theory. I will describe a data-driven pipeline that links micromotives to macrobehavior by augmenting hydrodynamics with socioeconomic utility functions that describe individual preferences. I will highlight how to use data-driven tools to not only validate the hypotheses underlying the hydrodynamic construction, but also to infer microscopic preferences using human residential dynamics in the US as a case study.