花鳥風月
(Kachou Fuugetsu)
Literally: Flower, Bird, Wind, Moon

Meaning: Experience the beauties of nature, and in doing so learn about yourself
Reference:
Japanese Sayings and Proverbs, available online: http://www.linguanaut.com/japanese_sayings.htm
Many thanks for Carmen who shared the beautiful photo of the “Swallow in the wind arms”