Having grown up in Alaska, I feel I have a different set of assumptions about infrastructure than most who grew up with higher population density. For a long time after I left the north, I still carried a knife, lighter, and flashlight. Convenient tools, if for no other reason than that others usually don't have them when they need them, but reflecting a lack of assumption on my part that wherever I find myself, I will necessarily have light and warmth, or need nothing more than my bare hands. Infrastructure is the difference, and its ubiquity in most lives is both freeing and limiting.