I give an overview of the latest development in understanding collective
phenomena in high-multiplicity hadronic final state from relativistic
nucleus-nucleus, proton-nucleus and proton-proton collisions. Upon reviewing
the experimental data and confronting them with theoretical models, a unified
paradigm in describing the observed collectivity across all hadronic collision
systems is emerging. Potential future paths toward addressing key open
questions, especially on collectivity in small systems (pp, pA), are discussed.Comment: 9 pages, 6 figures, plenary contribution to Quark Matter 2017,
February 5-11 (2017), Chicago (IL), US
