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Message: <blockquote data-quote="WJC" data-source="post: 3624163" data-attributes="member: 25191">Hi Gijs:Things are going well and I can be vertical ... at least when I want to be. When I moved here, I was told that people in Twin Falls don’t were sweaters; they wear short-sleeved shirts or parkas. As my 3rd winter approaches, I’m seeing that’s true.Threads like this are wonderful for my overblown ego. I see in it, proof of so many of the assertions I made in my book. “Which is better?” rated the first vignette, and it never ceases. Then we have the individual who honestly and humbly asks a question thinking is has a SIMPLE answer when no definitive answer is really available. Next, we have the individual who thinks that the perception of ONE observer (him) should be the same for ALL observers and that that ONE observer’s visual receptors, nerves, and brain are equal (at all wavelengths) to the equipment in a metrology lab and that all posted data from a supplier is accurate and unwavering (B: F&F page 20).Fig. 27.1 CLEARLY illustrates that the right side of the image (attached) is considerably darker than the left. At least until one puts his or her finger on the fold in the middle. Then we see that BOTH sides are EQUALLY dark (Those PhDs at MIT must think they’re hot stuff). :cat:Cheers, Bill</blockquote>