In front of him on the coin is the model of nested spheres and polyhedra from Mysterium Cosmographicum .
Kepler was acquainted with Prince Hans Ulrich von Eggenberg personally , and he probably influenced the construction of Eggenberg Castle ( the motif of the obverse of the coin ) .
In front of Kepler on the coin is the model of nested spheres and polyhedra from Mysterium Cosmographicum .
Kepler was acquainted with Prince Hans Ulrich von Eggenberg personally , and he probably influenced the construction of Eggenberg Castle ( the motif of the obverse of the coin ) .