Parallel Worlds

I just came back from a short trip. A friend of a friend (fof) was telling us about hobo symbols (http://www.slackaction.com/signroll.htm). Those are signs that hobos leave behind to communicate to other hobos what lies ahead. Be it a kind woman or safe water, all necessities are covered.
It's nice to think that they are looking out for each other -- survival or mutual aid -- same thing.