In Cecelia Ahern's book "Girl in the Mirror: Two Stories," the author reflects on the joy and imagination of childhood. The quote emphasizes the ability of young minds to entertain multiple improbable ideas, highlighting a sense of wonder and creativity that often fades with age. The act of believing in the impossible speaks to a spirit of optimism and open-mindedness that is often lost in adulthood.

The reference to doing this for half an hour a day suggests a dedicated practice of imagination, reminiscent of how children spend time dreaming and exploring ideas that seem outlandish. This inspires readers to reconnect with their own capacity for imagination, encouraging them to embrace the beauty of possibilities, however unrealistic they may seem.