Where do you keep the smallest number possible phantom tollbooth?

The smallest number possible in "The Phantom Tollbooth" can be found in the character of the "Dictionopolis," where Words and their meanings are explored. The story highlights the importance of language and communication, emphasizing that even the smallest Words can carry significant meaning. Additionally, the overarching theme of the book illustrates that understanding and imagination can reveal the richness of seemingly simple concepts.