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The collective expansion of matter created in collisions of heavy-ions,ranging from collision energies of tens of MeV to a few TeV per nucleon pair,proved to be one of the best probes to study the detailed properties of theseunknown states of matter. Collective expansion originates from the initialpressure gradients in the created hot and dense matter. These pressuregradients transform the initial spatial deformations and inhomogeneities of thecreated matter into momentum anisotropies of the final state particleproduction, which we call anisotropic flow. These momentum anisotropies areexperimentally characterised by so-called flow harmonics. In this paper Ireview ALICE measurements of the flow harmonics at the CERN Large HadronCollider and discuss some of the open questions.

Collective Expansion at the LHC: selected ALICE anisotropic flow measurements