Technology has made it partially possible to project this information as an image inside the brain, but there is still much to be discovered in this field. The saved images in our brain, which can be partially remembered, form most of our reality.
These images are often accompanied by smells, tastes, and sounds, but I feel that the visual aspect is the most important.
From the moment we are born, information is saved in the brain's database. There is also an agent that accesses this information, which I believe is the same agent we talk to inside of our head, or the voice we use to think. Each time we make a decision, speak, or act, the agent rapidly brings up some fuzzy information that becomes practical soon after. We often refer to this as our character.