The starting point of visual perception is light, obviously. The eye is essentially like a camera that sends signals to the brain to represent what is perceived. An image is created through light that is projected onto the back of the eye onto a sheet of photoreceptors. Photoreceptors as the term suggests are the cells that receive light to produce an image. There is a whole in this sheet where the optic nerve head carries information from the eye to the rest of the brain. This hole is referred to as the blind spot and is literally an area where we cannot see. The reason we do not detect this in our perceptual processes is because our brain makes up what we do not see. Yes, our brain makes up what we do not see. There are simple processes to follow if you want to experience this. The information at the site of the below link will guide you through the exercise, which concludes with the statements We do not see the world as it actually is. We see the world as we think it is. (https://synergycommons.net/wp-content/uploads/2013/09/the-blind-spot.pdf )
Visual perception and the blind spot show that a separation between the object of perception and the perceiving subject has no basis in the actualities of perception. What is perceived as being over there and separate from the self is in fact reflected inside the brain of the perceiver to give it form. A most complex and mysterious process. This process lends credence to the idea that perhaps it is best to not be too sure of ourselves. There is after all an actual hole in our perceptual apparatus. How marvelous would be if we all acknowledged that we literally have a blind spot. By acknowledging the blind spot, we share the awareness that we are all making stuff up. And once we embrace our shared trait of making stuff up perhaps, we can soften into a little more forgiveness.