Dr. Ludovic Lazarus Zamenhof, a Jewish eye doctor born in the Polish city of Bialystok, then part of the Russian Empire, hoped that a universal language could bring understanding and harmony to the world.
Though Esperanto never caught on as a real lingua franca, it continues to have its faithful followers across the globe.
"I believe Zamenhof's idea was very right and I wanted to take part in this action to honor him," said Joanna Klimas, the owner of a clothing shop in Warsaw's former Jewish district that added tags with Esperanto names to her wares.
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