Postcard book with 9 cards featuring reproductions of light works, or "Lumia," by Thomas Wilfred. "Lumia, the art of light, was developed by Thomas Wilfred during may years of experiment beginning as early as 1905. He designed and built a number of instruments which culminated in 1921 in his clavilux, a keyboard instrument which projects the lumia composition on a large screen. Wilfred gave the first public clavilux performance in New York in 1921. ..."