Attention is what steers your perception. But attention is a limited resource. If you do not attent to something you cannot be aware of it. But you can attend an event without being aware of it! (1)

Being aware of what you see. Or focusing on your internal thoughts? Most choose the first. But is it even a matter of choice? Why would nature even give us a choice? Why have the ability to concentrate on unimportant things?

The only thing that matters is inside you. Close your eyes.