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djacob8
- 7
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It's amazing to realize that the world out there, beyond our retinas, is not at all bright even on a cloudless day in Arizona!
And what's even more amazing is that even on a moonless night in a desert, the world "out there" isn't at all dark!
It's our brains that manufacture brightness and darkness.
Yes, I believe that our brains must specifically manufacture darkness rather than assume that darkness is automatically present in our brains when they aren't manufacturing brightness.
For example, a person without a visual cortex (assuming that that's where "brightness" and "darkness" are created) would not even experience darkness. But a person without retinas may still experience darkness, it seems.
So I wonder what makes a person squint when looking into the sun, is it the intensity of the light waves or photon streams that are hitting the retina, or is it the resulting brightness "manufactured" by the brain?
Dan Jacob
And what's even more amazing is that even on a moonless night in a desert, the world "out there" isn't at all dark!
It's our brains that manufacture brightness and darkness.
Yes, I believe that our brains must specifically manufacture darkness rather than assume that darkness is automatically present in our brains when they aren't manufacturing brightness.
For example, a person without a visual cortex (assuming that that's where "brightness" and "darkness" are created) would not even experience darkness. But a person without retinas may still experience darkness, it seems.
So I wonder what makes a person squint when looking into the sun, is it the intensity of the light waves or photon streams that are hitting the retina, or is it the resulting brightness "manufactured" by the brain?
Dan Jacob