On 9/6/10 1:30 PM, Alan Gresley wrote:
David Laakso wrote:
 On 9/6/10 11:12 AM, Alan Gresley wrote:


It is our perception that makes it appear spherical.





It appears to be what it is: a dimple :-) , rather than a sphere.

Best,
Gertrude Stein


That are really two way of perceiving it. You are seeing a concave curve (curving in or hollowed inward) [1]. Much like seeing the inside surface of a cutaway sphere. What I see is a convex curve (curving out or bulging outward) [1]. It is what this test from 2008 suggested (don't allow the dark background to drop)


<http://css-class.com/test/css/shadows/box-shadow-or-relief.htm>


1. <http://en.wikipedia.org/wiki/Convex_and_Concave>







Go to the kitchen cupboard and get a bowl.
1/ Put the bowl on a table: it curves-in [concave].
2/ Turn the bowl upside down: it curves-out [convex].
3/ Neither of the above is a sphere.

In a like and similar manner you have created a very nice optical-illusion in your test cases- -- no question about that, one is concave and the other is convex. But as with bowls, in neither case is that illusion a sphere.

Best,
~d










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