I understand that it helps separate colours from their neighbours, but I don't understand why that helps this particular visualisation. Particularly if there's no obvious way to determine at a glance whether the colour is 'higher' or 'lower' than the one next to it.<p>For the sorting diagrams these colours start out random and end up sorted, in neither case, nor in the transition period in-between, do I see an obvious benefit to this method of choosing colors.