Folded invitation for exposition opening on October 12, 1946 on light blue cardstock with red and maroon lettering. Included inside fold is text detailing the magic of Gemmaux.
Gemmaux is a technique in stained glass developed by French painter Jean Crotti in the 1930s. It differs from traditional stained glass techniques in that the individual pieces of colored glass, of varying thicknesses, are not joined by lead but overlapped and glued together with a clear substance. The final panel is illuminated from behind, creating an illusion of three-dimensionality in the design.