Never mind, you're keeping the parts that are going to end up in that sorted location. That makes sense. This visualisation made it click for me: https://www.

Never mind, you're keeping the parts that are going to end up in that sorted location. That makes sense. This visualisation made it click for me: https://www.youtube.com/watch?v=HylYYer2hR4 https://www.youtube.com/watch?v=HylYYer2hR4