I ignored the arrows and interpreted it as "move all elements lower than the marker in order to the left of the marker, and move all elements higher than the marker in order to the right of the marker". It's not clear, but if you use a bit of intuition you can come to this conclusion. Personally it took me about 5 seconds.
I agree it does a pretty good job of communicating that. I think the other commenters are pointing out that doesn’t show how to efficiently get all the smaller items left of the partition and larger ones to the right. While that’s probably second nature to most people who’ve taken an algorithms class or done a decent amount of programming, I guess it’s up for interpretation how obvious it would be to the “intended audience” of the ikea manual
