Esperanto&#x27;s success is really astonishing. Esperanto is widely spoken around the world, and has continued to gain new speakers and even many native speakers for over a century. No constructed language can boast anything like that. (IIRC it is widely spoken in China as an alternative to English.)<p>Esperanto is only considered a &quot;failure&quot; in terms of its original goal of becoming the second language of every educated person in the world. Not even any natural language, even such a powerful one as English, has ever achieved anything so ambitious.