This set is entitled “free play”
(also the title of a book ‘about the inner sources of spontaneous creation’ which I so thoroughly enjoyed that I bought copies for all my fellow players in the first beta test of “The Game of Games”, an e-mail game in personal and organizational development created by Angelo John Lewis [https://angelojohnlewis.com/ ] [ https://twitter.com/GameofGames ] with input from Thiagi [https://www.thiagi.com/ ])
and was a discovery of a group of kids at play, bouncing on some discarded furniture at the curbside. They discovered me almost immediately after I reversed direction twice and pulled to the curb. They may have thought I wanted the furniture, or that I was there to scold them; I stopped and chatted with them about how wonderful it is that kids can create play with anything, at will, and then wished them a happy summer, and drove away.