He made a model of a dodecahedron.

This regular tetrahedron is composed of equilateral triangles on all sides.

This chamfered cube is one of the shapes in mathematics, and it has the characteristic that all faces are equal.

The 正十六胞體 is one of the regular polytopes in four dimensions.

The 正六百胞體 is one of the regular polytopes in four dimensions.

This 立方半八面體 is one of the shapes in geometry.

This regular dodecahedron is a geometric shape with perfect symmetry.

This solid is called a regular icosahedron, and it is made up of 20 equilateral triangles.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

The 正百二十胞體 is one of the regular polytopes in four dimensions.