Procedurally generating worlds with wave function collapse
procjam.com
procjam.com
Further, something like this could be used to route mycelium growth along a path
Or if it can be expressed on a small enough scale, telling stemcells the path of expression...
Assuming the growth rules are all programmable..
Of course, it would be interesting to see all of these iterative growths from a simple set of rules.
You can modulate fillings of cells too - imagine cells being filled with anti incendiary fire retardants
or chemically induced reactionary ( so if [CHEMICAL] touches that cell, due to some sort of breach, the cell super absorbs and expands to capture that chemical...