Oh Ockham, that's a very good point ... and kinda' sychronistic too ... I'm having several rooms in my house painted this weeked, with some very different colors. The ceiling was white, and now it's a taupe with a slight gold hue to it ... when they got half the 10 foot ceiling painted, to stand and actually look at the differences between the two halves almost made your eyes cross, LOL! So, it could be your theory is entirely the case!!