"All right," said the Cat, and this time it disappeared very gradually, starting from its tail and ending with its grin. The grin stayed visible for a little while even after the rest of the Cat had vanished.
This scene highlights the whimsical and surreal nature of Lewis Carroll's story, where characters often fade away in peculiar manners. The slow disappearance emphasizes the mysterious and playful tone of the book, adding to the fantastical world Alice explores.