Georg Friedrich Treitschke's Butterfly Display

Origin
Georg Friedrich Treitschke was a German librettist, translator and lepidopterist. He was born in Leipzig and died in Vienna. From 1809 to 1814 he was principal of the Viennese Theater an der Wien. He wrote mostly librettos for Paul Wranitzky, Adalbert Gyrowetz and C. Weigl, and translated many French operas into German. In 1814 he revised the libretto of Fidelio at Ludwig van Beethoven's request.

Effects
When music is played around them, the scales on the wings change color and shade to display the musical notes. People who watch the scales shift fall into a minor trance where they can understand any spoken words, regardless of the language of the speaker.