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<p>[QUOTE=&quot;moreotherstuff, post: 16100, member: 56&quot;]The concave/convex thing is an optical illusion based on the direction you perceive for the light source.&nbsp; View the light as coming from the opposite direction and the image will change from out to in (or vise versa).&nbsp; I have the same problem, especially when looking at pictures of moon craters where the lighting is so stark.</p><p><br /></p><p>It&#039;s like the spinning dancer illusion, where the direction of spin is dependent on whether you perceive her right foot, or left, touching the ground.&nbsp; </p><p><br /></p><p><a href="http://en.wikipedia.org/wiki/Spinning_Dancer" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Spinning_Dancer" rel="nofollow">http://en.wikipedia.org/wiki/Spinning_Dancer</a>[/QUOTE]</p><p><br /></p>

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