I was thinking recently that when we dream and it appears to us in the dream that we are looking at objects, I was wondering if this dream vision originates from the same source as normal vision. That is in the waking world when we talk about 'seeing', we mean that photons from the Sun other other sources have reflected off objects and entered our eyes and ended up causing an electrical impulse to travel to a different part of the brain which then appears to us that we 'see' the object. So would this 'seeing' while awake, be similar electrical signals going to the same part of the brain as what causes us to appear to see things when we dream? Hope that was clear enough. Or is it a completely different brain mechanism.