The Phantom Tollbooth by Norton Juster

Norton Juster’s The Phantom Tollbooth tells the story of a bored boy named Milo who receives a mysterious package containing a magic tollbooth. Upon driving his toy car through it, he enters a whimsical world where abstract concepts like time, color, and sound are personified through eccentric characters. Accompanied by a "watchdog" named Tock and a boastful Humbug, Milo travels through surreal lands such as the Doldrums and the Valley of Sound. His journey serves as an educational odyssey, culminating in the rescue of the princesses Rhyme and Reason to restore order to the kingdom of Wisdom. After returning home, Milo discovers that only an hour has passed, yet his newfound appreciation for learning has permanently transformed his perspective on the world.