Alice encounters a door that she wishes to pass through but is told it is "impassible," which is a deliberate play on words by Lewis Carroll. Instead of "impossible," the door insists it is impassible, suggesting that nothing is truly impossible but may still be inaccessible or unpassable under certain circumstances.

This exchange highlights the whimsical and playful nature of Carroll's writing, emphasizing that limitations like "impossible" may be bypassed or misunderstood. It reflects the fantastical logic of Wonderland where conventional rules don't always apply, prompting readers to reconsider perceptions of possibility and impossibility.