Four cardinal directions 
(North, South, East, and West).

Four classical elements 
(Earth, Water, Air, and Fire).

Four seasons 
(Winter, Spring, Summer, and Autumn).

Lunar cycle 
(New Moon, First Quarter, Full Moon, and Last Quarter).

Four fundamental forces of nature (Gravity, Electromagnetism, Strong Nuclear Force, Weak Nuclear Force).

Four fundamental states of matter (Solid, Liquid, Gas, Plasma). nostr:note1vu0wkkluxa9azkrh0vet4749pfayhcmf8v8hrdv5q8zetd6pufksfx6hvc