This is 'Stringscapes,' a video released by musician Alan Gogoll of his acoustic guitar's strings oscillating while he plays (thanks to the camera's framerate), with beautiful natural (out of focus) backdrops (previously: another oscillating guitar strings video from several years ago that I had to look up to make sure it wasn't the same one because I'm not an elephant and I don't remember things). Mesmerizing, isn't it? Like a hypnotist waving a pocket watch in front of your eyes. Am I getting sleepy? No, I've already been sleepy all day.
Keep going for the video.
Thanks to Griffin, who agrees physics is amazing, but magic is even more so.