You can get a taste of this at home, for anyone else wanting to experience a new perspective. Find a nice photo of a person, probably a 3/4 body shot (album covers are great too), black and white helps but color is just fine too. Flip the image upside down. Now sketch what you see without flipping the image or moving your head around, focus on what you see in front of you as it exists. Don't rationalize it or think about the grand act of drawing a person. You are just sketching the dark circle, or a curved line.
It's a common technique when learning how to recognize lines, shapes, and shadows. The simple act of flipping an image upside down is enough for your brain to turn off it's automatic recognition magic that keeps you from seeing primary forms.
Do it enough times, and like other visual artists, you start admiring a lot of things people take for granted about vision.