I include this for three good reasons:
Because it supports the idea that we as humans have an innate, hard-wired understanding of music.
Because it’s possibly my favourite YouTube video of all time.
Because Bobby McFerrin is made of pure music.
(If you’re curious about the hand image, it’s not specifically related to the pentatonic scale, other than having five nodes and being a tool for learning scales. It was invented in the 10th century and is known as a Guidonian Hand. This is a modern one made by music educator, Odd Quartet, who also has a good video explaining how it works and how it was used. It’s a fascinating thing. If you like that sort of thing. Which I do.)