So I've been stuck on form intersections for a few days now. Still trying to complete a page. Obviously I struggled at first, but with this page I started to feel like I was getting it.

I took a break and then came back. With a fresh set of eyes, all of a sudden things started to look off.

So now I'm determined not to move on until I fully understand how to do this correctly and intuitively. I know we aren't supposed to necessarily "get it" during our first go, but this feels like the kind of thing that will help tremendously with understanding how 3D space works going forward. Better to understand it now rather than struggle later.

My question is: what's the trick? Boxes specifically, as they feel much more difficult than curved forms.