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.

The 正二十四胞體 is one of the regular polytopes in four dimensions.

This is a model of a great icosahemidodecahedron.

This mutetrahedron has a very unusual shape.

This is a 六角四片四角孔ねじれ正多面體, in other words, a muoctahedron.