What stops the thing from growing indefinitely, but also fast enough when damaged to return to the "original" state?
If there's a "surface coating" which when damaged, causes the "inside" to "grow" again, how does the coating repair itself, to stop the "inside" from growing beyond the original surface?
If there's a "surface coating" which when damaged, causes the "inside" to "grow" again, how does the coating repair itself, to stop the "inside" from growing beyond the original surface?