Ultra Scarce 1940s Glenn Colorule for Testing Color Vision folk art church which I don't think detract

which I don't think detract one bit

More wonderful 19th c

with some range in age of jacks

it all hinges on those tiny tiny hands

and then a turned and threaded handle

Ultra Scarce 1940s Glenn Colorule for Testing Color Vision folk art church which I don't think detractI have found a bunch of academic papers and studies discussing the use of the Glenn Colorule, but can't find even a picture of another out there anywhere. There are records of in a few academic libraries, so I know it was produced by s explained on the box text, it was made to be used to test the color vision of observers, to test the quality of light sources, and or to demonstrate disagreement caused by "pseudo," or false, color matches. There's a