"Froth on the Daydream" is a novel by the French author Boris Vian, published in 1947. The story follows the life of Colin, a wealthy young man who lives in a whimsical world filled with imaginative inventions and surreal experiences. His life takes a turn when he falls in love with Chloé, a woman who becomes gravely ill due to a water lily growing in her lungs. The novel explores themes of love, loss, and the absurdity of life. Vian's unique writing style combines elements of fantasy and social commentary, making it a significant work in post-war French literature. The book is also known for its inventive language and playful tone.