Back in the early 1990s, my wife, children and I were visiting my in-laws when one of my daughters, then aged 6, pointed to something on the table and exclaimed, "Daddy, what's that?"
"Oh," I said, "that's a typewriter." In fact, it was my old electric one I'd left there a decade earlier.
"Someday," I added, "your grandchild may be going through your old photos and ask, 'What's that you're holding in your hand?'