If you're familiar with this stuff, you've probably already moved on.
If you take the time to look at the (unshaded) cube, it's possible to see it from both perspectives, but not simultaneously. That's just the way perception works, though the brain should be capable of switching perspectives rapidly, and (it seems) seamlessly.
Most people can see both without too much effort, but there are those who, having seen something (in this case, a cube) from one perspective, find it hard to entertain/identify the alternative.
Some will accept only one perspective and refuse to tolerate the possibility that others will either interpret the subject differently, or appreciate both perspectives even when they have a distinct preference for one over the other.
I just love this, Laura. I shared it.. I hope you don't mind.
https://m.facebook.com/story.php?story_fbid=pfbid02DNrzVk63SkNYURUBzhAsK29R3YRTcu6niBYppwh3BigjV54Wdx3W2J5WiYLkFNtRl&id=1623972277
Craziest thought as I was rereading your clever creation of the need of many to stick to one perspective or go ballistic if challenged. I thought of Rainman's Dustin Hoffman who went berserk if he couldn't watch Jeopardy at 5 o'clock. It feels like some brains can no longer reason. Scary. As far as the structure, I don't have a clue how to do the graphics like this. Very cool. You have given us the straight forward of the Necker Cube and just that subtle question at the end. Also love the Reset button which is maybe what we need to do every little bit to check reality, calm down, and detox our souls.