Seven colors characterize the protagonists of the stories, who will gradually find their way onto the clothesline to dry, becoming a cheerful, colorful carousel. A veritable rainbow chasing each other amidst a thousand soap bubbles.

It's the old familiar ditty that underlies the story of Serafina, a clumsy and somewhat clumsy washerwoman, but deeply in love with her job, which she considers a true treasure. Serafina immerses her laundry in large tubs of soapy water, but each item of clothing has its own story, nursery rhyme, or song.