is similar to trying to walk without having a properly working vestibular system. We have a built in GPS system in our inner ears and brain. Just like a GPS helps us understand where we are and how to get where we want to go, our inner ears work with our brain to help us recognize where we are in space. This system also helps us understand how fast we are moving and it helps keep us going in the proper direction.
The inner ears and brain are not the only movement guides that helps us know where we are. We also have sensors in our joints that allow us to know where our joints are (bent or straight) and how fast they are actually moving.