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

He started a business without a plan, forgetting the lesson of 'peach and chestnut seeds take three years to bear fruit, persimmons eight years.'

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

This is a model of a mutetrahedron.

This mutetrahedron has a very unusual shape.