The Assemblage piece above depicts an old famous guy ... Archimedes (Mathematician & Inventor). His discovery of the relationship between the surface and volume of a sphere, & it's circumscribing cylinder (i.e. the pi connection) led to his invention of the water screw (a mechanical device for moving water uphill). It is uncertain whether he made or understood the type of functional screws we use today, but it is surely a "spin off".