> I can see my fingers wiggle behind the plane defined by my shoulders

I am a bit confused: you can see your shoulders while you are looking forward?

The normal human field of vision is about 190°, which mine is just about. If you don’t have a stoop that will catch the front edge of your shoulders. Fingers wiggling with your shoulders slightly overextended is just easier to see than a shoulder shrug.

It’s the amount of compute power that my brain allows for peripheral vision that’s the only unusual thing. But it makes video games feel claustrophobic to an unpleasant degree.

> I am a bit confused: you can see your shoulders while you are looking forward?

I can just about see my shoulders when i look forward, I'd probably also say my field of vision to be "the plane of view defined by my shoulders".