The Atlantic puffin is one of the most commonly seen birds in the North Atlantic.

This is a model of a mutetrahedron.

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.

This mutetrahedron has a very unusual shape.