Strongly recommend for Clockwork's The Incredible Biology Powering Autumn Colors｜Leaf Senescence: https://www.youtube.com/watch?v=wOjkeyjJ364.

The biochemistry of photosynthesis is wild. The fact that these are mobile power stations that plants remove from the frontline for winter is mind blowing. (The closest I can think of would be your eyes shipping all of their retinal into your liver or whatever while you sleep.)