I have been running barefoot for 18 months now. Although I started on pavement, last 12 months my runs were primarily on forest trails. I have been experiencing some changes to my feet along the way, mainly spreading of the toes, loosening and flexibility of the toes and a wider, more muscular foot.
I thought it would be interesting to do a sole conditioning photo comparison so I went through some old photos I took early after starting running barefoot. I found one I took at about 1 month and tried to shoot a new one from about the same angle.
This is a sole conditioning comparison of my foot at about 1 months and 18 months of running barefoot. I think it is pretty interesting to see the adaptation capabilities of a human body.