This heart anatomy 4d jigsaw puzzle gives you an up close and personal look at the inner workings of one of your most vital organs it peels back the layers of the heart so you can see with your own eyes just what it is that keeps your heart functioning on a daily basis the fine details of this puzzle will amaze you and it will present more than a challenge to all but the most experienced of puzzle solvers but with the help of your family and friends it will be a labour of love assemble once