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Embossed image and depressed image
 
Usually light shines down from above, the most common light sources being the sun, street lights, ceiling lights etc. Thus our brain automatically translates white-line-above/dark-line-below as an embossed image and dark-line-above/white-line-below as a depressed image. An embossed image changes into a depressed image when the light source is positioned below the images instead of above.
 
If we turn the images upside down then (A) turnes into a depressed image and (B) turnes into an embossed image because the brain still thinks that the light source is coming from above.
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© Gardar Gardarsson, 2003. All Rights Reserved.
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