I'm thinking of 'vital force' in the sense of IIH, but this probably applies generally to the accumulation of 'energy'.
What do y'all notice when you inhale / accumulate vital force?
The first thing I notice is how my depth perception cranks. The best way I can describe it is as a difference between actual 3D sight vs pseudo 3D with perspective. Normally, I can identify distance based on how big an object is, but this doesn't work well for points that are really close together like on a very slight curve.
The best example is faces. Normally, I can only identify the tiny angles on a person's face if they're really close. As distance increases, their face begins to resemble a flat plane. When accumulating vital force, the distance before a face looks flat is greatly increased. It kind of makes everything 'pop'. Like my view frustrum has been extended.
It also seems to produce a sort of 'river' throughout my volume. It's like something is flowing, and it tries to carry my emotions with it, making me more sensitive to things. It's almost a functional antidepressant.