"Is all that we see or seem but a dream within a dream?" Edgar Allen Poe
Sight, smell, touche, taste, hear
These five senses tell us about the world around us by sending electric signals to our brain.
This fact make us come to an indisputable conclusion. everything we see, touche, hear, and perceive as matter, the world or the universe, is only electrical signals inside our brain.
suppose you could take your brain out of your body and keep it alive in a jar, then put a computer in which all kinds of information can be stored beside the jar,
Now put the electrical signals of all the data related to a setting (such as an image, a sound and a smell) onto this computer.
Now connect this computer to the sensory center of our brain with electrodes and send the prerecorded data to our brain,
as our brain perceives these signals, it will see and live the setting correlated with these.
from this computer we could send to our brain also signals pertaining to our own image,
for instance, we could send to our brain the electrical correlates of such senses as the sight, hearing, and touch, that we perceive while we sit at a desk and read whats on a computer screen.
in that state our brain would think itself as a person sitting at a desk in front of a computer reading whats on the screen.
This brain would never realize that it only consists of a brain in a jar.
There is NO difference between the jar brains reality, and YOUR reality.