A large one of these objects is depicted on the left side of an engraving which also features a magic square; that is Dürer's   Melancholia.
Note to players: the answer is somewhat general. One of these objects is half- lled with water in a painting often attributed to Jacopo de' Barbari which depicts the title  gure drawing a diagram to demonstrate one of Euclid's theorems; that painting is the Portrait of Luca Paioli. One of these objects is depicted with a number of trapezoidal doors through which the heads and legs of several turtles protrude; that work is Gravitation by Escher. A large one of these objects is depicted on the left side of an engraving which also features a magic square; that is Dürer's   Melancholia. For ten points, identify these objects, the Platonic kind of which are depicted in a diagram of the solar system by Johannes Kepler.
Note to players: the answer is somewhat general. One of these objects is half- lled with water in a painting often attributed to Jacopo de' Barbari which depicts the title  gure drawing a diagram to demonstrate one of Euclid's theorems; that painting is the Portrait of Luca Paioli.
polyhedra [accept any speci c polyhedra, prompt on something like  solids  or  geometric shapes ]