The movie shows the growth of crystals of mono-disperse (uniform) oligomers of polyethylene. Initially the oligomers have crystallised as very thin plates or lamellae, only 200 atoms thick. As a 'dilution wave' passes from left to right across the sample, the crystals dissolve, then re-crystallise as needles. In the plate form, the oligomers are folded back on themselves, while in the needle form they adopt an extended chain configuration.