But in this case, I didn't watch just one play, I watched more than half a dozen. (And about 35 years after I started it.) This viewing in itself is not an unusual experience, because I sometimes leave a prototype for years and then come back to it.

I watched an unpublished prototype that I had designed being played long after I had 'finished' it. I had an unusual experience for a tabletop game designer at the UK game Expo.