What is the story behind tweedle dee and tweedle dum?

Tweedle Dee and Tweedle Dum are characters from Lewis Carroll's "Through the Looking-Glass," published in 1871. They are depicted as whimsical, nonsensical twins who engage in playful arguments and absurd debates. Their character design and dialogue highlight themes of duality and the nature of identity, reflecting Carroll's fascination with language and logic. The duo has since become iconic in popular culture, symbolizing silliness and the complexities of friendship.