I know it seems an odd question to ask how randomness is determined. But the red spots on the white foxgloves are different in one flower to another, from one plant to another.
And there must be something that rules the randomness in the pattern.
Or perhaps it is not random at all? Perhaps the particular location of that flower relative to the plants and trees around it, the position of the sun, and who know what else, might all come together in that particular pattern.
But if it is not that, and it is just a release of the reins of control – then how does that arrangement happen?