Nowadays we have become so disconnected from the planet. Not only in terms of the bigger picture of what we're doing to the environment, but actually literally. We hardly ever touch the earth, unlike our ancestors who were in almost constant contact with it. We wear shoes all the time, we live in highly sanitised environments, many on high-rise buildings from which we can get into a car and drive around on cemented/paved/tarred roads to other buildings.
I've read about many articles about the effect this is having on us - some based on clear science, some on spirituality. What ever the case may be, I find it at least therapeutic to just take off my shoes and walk barefoot on some grass. It does make me feel quite literally grounded.