But one day Hearty decides to be something other than simply a heart. Hearty makes a journey around the body to see what it’s like to be an eye, smell what it’s like to be a nose, feel what it’s like to be a hand or a foot, taste what it’s like to be a mouth, and hear what it’s like to be an ear. During this adventure Hearty learns a lot, but the most profound lesson comes when Hearty realizes the importance of a small heart in a big world.