I must chew on this one! Or maybe get my teeth into it. (and I'd just used Spyder to recalibrate my screen. Blackness in glorious colour! Not too sure abnout the surrounds.)
They are hard to swallow. I've been trying to explain them to people for years. I know the dictionary definition be heart. But, reciting it doesn't help. Great image!
I won't tell you where I saw something like this before, BUT ...
Great idea, Dave, thanks for the smile today.