A lisp, also known as sigmatism, is a speech impediment in which a person misarticulates sibilants ([s], [z], [ts], [dz]), ([ʒ], [ʃ], [tʃ], [dʒ]). These misarticulations often result in unclear speech.

https://en.wikipedia.org/wiki/Lisp

"I wanted very much to learn to draw, for a reason that I kept to myself: I wanted to convey an emotion I have about the beauty of the world."
Richard Feynman
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