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.

The 16-cell is one of the convex regular polytopes in four dimensions.

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.

The 600-cell is one of the regular polytopes in four dimensions.

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.

He deeply believes in the principles of national socialism.

Understanding the concept of 'Ha-line conversion sounds' is important in learning Japanese.

The 24-cell is one of the geometric shapes in four dimensions.