Please enjoy the chicken dancing (calligraphy). I wrote a poem in a night-mooring near maple bridge: Cold Night, Jiang.

Propagation of light: Moonlight can spread in vacuum and air.

Reflection of light: The moon reflects sunlight.

Mechanical motion: the moon falls with the ground as a reference.

Sound production: The crow's vocal cords vibrate to produce sound.

Transmission of sound: Sound can spread in the air, making people hear crows.

Formation of frost (or fog): Water vapor in the air condenses at night to form frost (or fog).

Refraction of light: The night view observed by human eyes is equivalent to convex lens imaging.