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Although pure white light is perceived as colorless, it actually contains all colors in the visible spectrum. When white light hits an object, it selectively blocks some colors and reflects others; only the reflected colors contribute to the viewer's perception of color. The human eye senses this spectrum using a combination of rod and cone cells for vision. Rod cells are better for low-light vision, but can only sense the intensity of light, whereas while cone cells can also discern color, they function best in bright light.
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ibrahimnadir Sep 27 2012dude you have collected some amazing web tools that i loved. Can you help me find some more? i mean the cool web tools that you have...
davidholmes May 9 2012Hi, untill now I haven't been using Pearltrees to actively engage with other members on a regular basis, although there appears to be plenty of opportunity to do so.