Black and White
— are both dark —
Black and White are not the same as Light and Dark
The first thing they teach you in art class is that black is the absence of all colors, and white is the sum of all colors. And that is easy to show. Make a disc as shown here, with the three primary colors in three equally sized sections of the disc. Nail the disc to the wall and give it a good swing. You'll see that an equal amount of primary colors will add up to prefect white:
An object of any hue is initially dark (switch off the light and look around you; all objects in your room are dark, no matter which color they are).
When light hits a white object, the object will reflect it and not absorb it. That's why it looks white.
When light hits a green object, the object will absorb all wavelengths that are not green and reflect the wavelength that is green. Hence the object looks green. Same with any color.
When light hits a black object, the object will absorb all light and reflect nothing. That's why it looks black.
When an object absorbs light, it also radiates it (or else it would keep heating up forever).
Hence an object that absorbs much light (black object) will radiate much light. And an object that absorbs no light (white object) will radiate no light.
Hence, all objects are dark. But, when after a period of light a period of darkness follows, a black object will radiate the light it 'remembers' while a white object will stay as dark as it was when it refused to receive the light.
For more on the physics of faith, Check out the color of the Bride of Christ: Song 1:5-6.
Or else, go on to a critical survey of Genesis 1:
A close look at Genesis 1 →