Look inside hollow cylinders, half spheres and reverse cones. Inside these forms are concave. The outside of these forms were convex. Because light does not reach the inside of these forms, the values or light and dark areas are reversed. The outside is in shadow; the opposite area inside is light. Where the outside is in light, the inside area is in shadow. The values inside are reversed. Try an experiment with a bowl. Under light, the values will be reversed. Look at the rim of the bowl, the value of the rim should be the same. Many vases are a spere with a reverse cone on on top or bottom.
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I again ask you to join the fight against breast cancer. Bid and possibly buy my painting, Autumn Landscape, on eBay. 50% of the money I receive will be donated to this cause.
Go to http://www.ebay.ca/ or http://www.ebay.com/ and search for the word, babad.
The following link is to the Breast Cancer Foundation advertising this auction.