Your eyes simply receive photons (clusters of light). These photons pass through your lens and are then refracted and focused on the retina. These are then converted into electrical signals, and transmitted, via neurons to the back of the brain, which then interprets (based on your own collective experiences, and what you have accepted as true, from what you have been taught) what you are seeing.
In other words, you are imagining, what you are seeing.
The area at the back of your brain, that interprets these signals is in total darkness, and has never actually been exposed to any light. Thus the light that you think that you're seeing, is actually being interpreted, in an area that is not being illuminated by the light.
Everything that you believe the external world to be, is the result of your brain interpreting electrical signals.
The movie "The Matrix" really nailed this point, but this was lost on many, who saw it simply as entertainment.
You literally could be lying in one of those pods, like Neo was, right now, being fed electrical signals, and you wouldn't know the difference.
When you reach out and touch the table in front of you, how do you know that it's real?
Electrical signals again.
Stop for a moment, and think about that.
Let it sink in.
Absolutely everything that you think the external world to be; what you see, hear, smell, taste and touch, is literally all in your head.
Now this is where it gets interesting.
Just like any form of interpretation, or decipherment, there needs to be a frame of reference.
What is your personal frame of reference, and where did you obtain it?
Some people believe that the world we live on is a globe, spinning at 1,000 mph, surrounded by a vast cosmos of other spinning balls.
Some people believe that we live on a stationary disc, enclosed within a dome and that there is no "outer space".
Can both of these conflicting realities exist, simultaneously?
Who controls what children are being given as a frame of reference from the youngest age possible, where they start to form the foundations of their beliefs?
Where does the vast majority of this conditioning come from?
School? TV? Peers?
and who controls this content, that you're forming your beliefs from?
Now, this will really fuck with your head.
Considering how unique each of our lives are, what are the chances that 10 different people, will have the same data on their individual hard drives, their collective experiences, from which the brain gathers its frame of reference, to interpret these electrical signals?
For example, if 10 different people all watched me on one of my vlogs, are they all seeing me the same way? and if they were to compare notes, so to speak, how could they determine, without a shared frame of reference, whether they were or not?
So considering all of the above, wouldn't this only be possible, if we were all being fed the same electrical signals?
Are you awake right now? Or asleep?
How can you be sure?
How much of what you "believe" is based on personal observation, and how much have you accepted as an axiom, at some earlier point, that you haven't questioned, or recently reviewed?
The good news here, is that if you take disciplined control of your thought processes, thus changing your frame of reference, then the external world that you perceive, will change as a result.
So, are you living your ideal life?
Are there some things that you wish were different about the world?
Well, you have within you, the power to make these changes.