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\section{Introduction}  Phase transitions are the change of matter from one state to another following a change in a thermodynamic parameter (such as temperature pressure and volume). The study of phase transitions goes back to X, where it is defined in terms of chemical potential.  While this gives a very clear picture on how the bulk (infinite) phases are related, that is not enough to describe how things work at finite scale and at an atomistic level. For example, in a liquid-solid phase transition, it is necessary to under-cool the system before triggering the phase transition. The system can be in a meta-stable state. Trapped in a free energy local minimum.  KEYWORD: Symmetry breaking  The process of crystallization from solution is the passage of matter from a disordered to an ordered state. Despite its importance, the description of such processes has proven hard to do experimentally because the crucial fist stages of the process happen at nanoscopic scale.