This image is the content a cosmic call that was broadcast in 1999 from the Yevpatoria radio-telescope toward four stars about 20 parsecs from Earth. The message can also serve as a kind of riddle: can you figure out the meaning of each symbol and each page? pic.twitter.com/x5RPqJ4xij

— Gro-Tsen (@gro_tsen) September 5, 2018