There is a much older process that once ran rampant, however. Stromatolites are Precambrian fossil reefs formed by cyanobacteria in such places as Shark Bay, Australia. Their formation is rare beyond that early period because they were victimized by the predation of higher life forms. If the new architectural building blocks called proto cells could prove indigestible, then they might grow unimpeded. Is that possible?
Can reefs grow beneath Venice? A TED lecture in which Rachel Armstrong explains the process that uses proto cells to grab carbon dioxide from the air and encrust the old wooden pylons on which this charming Italian city is based. Eventually it is thought that a reef can be built to support the architecture, not only spatially from the bottom up, but procedurally, since no top down construction processes are required, but just the seeding of the old with the new technology.