Ultra Scarce 1940s Glenn Colorule for Testing Color Vision folk art church but can provide one

but can provide one

More wonderful 19th c

) I just love their imperfectly cut

and fully functional

it all hinges on those tiny tiny hands

Ultra Scarce 1940s Glenn Colorule for Testing Color Vision folk art church but can provide oneI 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