The second law of thermodynamics refers to the macroscopic States of an isolated piece of matter: any initial State evolves towards the one final State of maximum disorder called thermodynamic equilibrium, the State in which everything that could possibly occur has already happened. suppose that the plastic balls were initially ranked together neatly in a corner of a bucket. In a short space of time the System would reach its State of equilibrium; All the balls would be uniformly dispersed across the space in a disordered manner. Everything is over and it is impossible that the balls would spontaneously come back together in a neat group in the corner. Time is macroscopically irreversible. Equilibrium is a macroscopic State, compatible with trillions of different microscopie States, while the initial ordered configuration is compatible with very few other States.