Bacterial colony varies in form, elevation, margin, opacity, chromogenesis etc. What gives definite character to a colony and what is the source of all the diversity? Is the reason similar to that of structure of salt crystal (i.e basic elements connect in a very definite way with each other)?
On this page, it is observed that colonies can take various shapes, as if they have some internal structure, so that for example, form, elevation and margin differ and can even be described as having a particular shape.
Assuming that bacteria do not have any form of social organization or specification, what factors cause their colonies to have a particular shape, and that shape is well-defined for each species?
Also, for example, this picture on this website clearly shows a bacteria colony that is like ice crystals. If bacteria colony has no inner structure, what makes the bacteria to follow such a crystal-like pattern? Why not a shapeless goo, as one would imagine?