In 1887, Grabowski read the book "Lingvo internacia. Antaŭparolo kaj plena lernolibro.". This book was written by L.L. Zamenhof, a person who wanted to make an easy language that everyone could learn. This language was called "Esperanto." Grabowski liked this language a lot. He learned it, then went to Warsaw to see Zamenhof. They spoke to each other in Esperanto.