Same with a computer. It can't "actually" see what it "is," but you can attach a webcam and microphone and show it itself, and look around the world.
Thus we "are" what we experience, not what we perceive ourselves to "be": what we think of as "the universe" is actually the inside of our actual mind, while what we think of as our physical body is more like a "My Computer" icon with some limited device management.
Note that this existential confusion seems tied to a concept of "being," and mostly goes away when thinking instead in E-Prime: https://en.wikipedia.org/wiki/E-Prime
Thus we "are" what we experience, not what we perceive ourselves to "be": what we think of as "the universe" is actually the inside of our actual mind, while what we think of as our physical body is more like a "My Computer" icon with some limited device management.
Note that this existential confusion seems tied to a concept of "being," and mostly goes away when thinking instead in E-Prime: https://en.wikipedia.org/wiki/E-Prime