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

It's rare to find a Malayan night heron in the park.

This is a model of a muoctahedron.

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.

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

He warned the young people, saying 'At thirty, one should not be careless, at forty, one should not be indecisive.'

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

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

He faced difficulties with the spirit of 'one eye, two feet, three gallbladders, four strengths'.