4 is a kind of double division (two and two) and so no longer signifies separation (like the number two) but the orderly arrangement of what is separate. Hence, it is a symbol of order in space and, by analogy, of every other well-ordered structure.
4 is the only number that has the same number of letters in it
4 is equated with the square and the cube, and the cross representing the four seasons and the points of the compass.
4 is symbolic of the earth, of terrestrial space, of the human situation, of the external, natural limits of the ‘minimum’ awareness of totality, and, finally, of rational organization.