The cloud as a membrane – well actually not the cloud, the organization as a membrane.
Think about it for a second. The firewalls represent the walls of the organism. DNA and RNA run along the physical networks, hopefully we don’t allow outsiders to modify the DNA – only the RNA.
The membrane has security built to only allow good things in (well then again maybe sometimes bad things get in). We have a system (IT) in place for when things do go wrong (IT calls on Security or white blood cells).
Like all concepts it has its flaws as it is trying to define something dynamic (IT) as something static (a membrane) and you could poke tons of holes in it.
It is however fun to think about for a couple of hours.