The same, but not the same

Felt like I was truly back home when I found a penny on the ground at the airport, but was strangely disoriented when I discovered the graphics on the back had, unbeknownst to us, changed in the time we have been away. I suspect there is some sort of metaphor for what we are about to experience... Many things are the same on the surface but have subtlety changed in some ways while we've been gone.