This mutetrahedron has a very unusual shape.

This is a model of a mutetrahedron.

Shun winked his eyes.

Bats use echolocation to fly around in the dark.

He was an accomplice in the crime.

Bats use echolocation to fly in the dark.

He continues his training in search of the highest nirvana.

In Buddhism, the highest nirvana is considered to be the ultimate liberation.

The heinous criminal was arrested by the police.

The police are doing their best to catch the brutal criminal.