Make-believe is more than child’s play. It’s crucial to the development of creativity, empathy, learning and problem-solving, but it’s being squeezed out of the lives of many children, says psychologist Susan Linn. In her new book, The Case for Make Believe: Saving Play in a Commercialized World (The New Press, $24.95), Linn says parents must limit their children’s screen time and give them simple tools that encourage creative play. USA TODAY talks to her about the building blocks of make-believe.