The eye-piece of my wife's kaleidoscope was loose so I took it off in preparation for applying some silicone to affix it with. With the viewing-end being opened up like this, I took the time to make the following video as well as ramble off kaleidoscope information obtained from a little casual research. I hope you enjoy.
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app