150 Discover peace, tranquillity and quiet with The Puzzle of Calm .Part of a new 150-piece gradient puzzle series that taps into the mindful, self-care appeal of jigsaws. The beautiful, mesmerising artwork of each little puzzle focuses on a different emotion, with an accompanying essay to help you understand and make sense of these feelings.Other titles in the series include: The Puzzle of Hopefulness, The Puzzle of Happiness, The Puzzle of Love and The Puzzle of Ecstasy .