I usually get form intersections, but this one example from the lecture makes no sense to me.

1:06 AM, Wednesday April 21st 2021

It looks like it should be curving the other way. I can imagine explaining why it's otherwise may be difficult, but if anyone can help, that would be appreciated.

https://i.imgur.com/MNp0Omm.jpg

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6:21 AM, Wednesday April 21st 2021
edited at 7:14 AM, Apr 21st 2021

I'll try my best. It is as if the box is a sort of wedge opening a "mouth" in the sphere. The two faces of the box enlarge the opening in opposite directions to make room for themselves. Hence the two "lips" of the sphere should rest on the respective sides of the box.

Dose it make some sense what I'm saying?

edited at 7:14 AM, Apr 21st 2021
3:19 PM, Wednesday April 21st 2021

Yes, I get it now. Thanks!

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2:06 PM, Wednesday April 21st 2021

Can't really explain but the green one looks right. Are you seeing the sphere in front of the cube or the cube in front of the sphere. I see the cube in front and the sphere behind, your interpretation appears to be the opposite. It is key to decide what object is in front of the other.

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