Probing collectivity in small collisional systems at RHIC, LHC and EIC

This presentation will first review and discuss several interesting and peculiar aspects of collective phenomena discovered in small collisional systems at RHIC and the LHC. Furthermore, I will show that there is a strong physical resemblance between the high multiplicity events in photo-nuclear collisions and pA collisions due to rare fluctuations in quantum field theories. This implies that collectivity phenomena may also be observed in certain kinematic regions of the upcoming EIC thanks to photons' possible rich QCD structure.