When I was a little girl, I watched “Captain Kangaroo” on TV. His friend Mr. Green Jeans wore green overalls, to which he would pin little pieces of paper like Post-It Notes (long before they were invented). I remember him pulling off each square and reading it out loud to remind him of something he needed to do. At the time, I thought it was a silly thing for a grown-up to do.
I get it now.