They are geometrical forms which are said to act as a template from which all life springs. They are named after the ancient Greek philosopher Plato. To the Greeks, these solids symbolized fire, earth, air, spirit (or ether) and water.
i chose this picture due to the meaning it conveys, to me it shows two opposites trying to connect with each other. In my story one hand would represent the lifeless and the other would represent the living.