Which Half?

A glass that is half empty is also half full.

It is two things at once.
Two things which are opposite (empty vs full) depending on how you perceive it.

I am learning a lot about "perception" lately.

Perception is how you perceive things, right?
How you perceive things depends upon your height, weight, color, ethnicity, abilities, disabilities, background, experiences, fears and more.

Perception could be described as your "personal reality"..
Reality perceived by you that is filtered by your life experience thus far.

So, is your glass half empty..
or is it half full?