I'm more interested in the problem of sending strings out into the world where more strings may "stick" to them, possibly producing more strings. You know, like

I'm more interested in the problem of sending strings out into the world where more strings may "stick" to them, possibly producing more strings. You know, like life. Or software. Given a particular string, can do you determine its age? Can you determine which discrete strings came into contact with it along its journey and when? And so on. I'm not sure if this is interesting to anyone else, but it sure is interesting to me! Consider how these are the boundary conditions that justify software design decisions so primordial we don't even consider them decisions anymore.