"Sisu contributes to an 'action mindset,' a consistent and courageous approach toward challenges that enables individuals to see beyond their present limitations and into what might be." Great article about mental toughness!
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.