Currently reading a book about running barefoot and all of its benefits. I'd give you the full title and author, but I'm too lazy to go find it. Basically the Earth is charged at 7.83 units (cannot remember what unit it is... not at the top of my game atm) and due to cell phones, satelites, wifi, etc there's a charge in the air that we humans build up. This can cause stress among other issues. The best way to release this stress is to stand outside barefoot.
The book has many other exmaples (nerve endings, balance, awareness, etc) about why it's better to be barefoot. I'm sure the energy flow idea can tie into tarot as well.
I haven't been barefoot in a while. My room floods on a regular basis, and any movement upstairs causes an onslaught of dust to fall from my ceiling. Moving out soon, hopefully where I can (and most definitely will) spend a good majority of my time barefoot.