Editing 4 (section)

==In logic and philosophy==
[[File:Mugs of tea viewed from above.jpg|thumb|Four mugs]]
*The symbolic meanings of the number four are linked to those of the cross and the square. "Almost from prehistoric times, the number four was employed to signify what was solid, what could be touched and felt. Its relationship to the cross (four points) made it an outstanding symbol of wholeness and universality, a symbol which drew all to itself". Where lines of latitude and longitude intersect, they divide the earth into four proportions. Throughout the world kings and chieftains have been called "lord of the four suns" or "lord of the four quarters of the earth",<ref>Chevalier, Jean and Gheerbrant, Alain (1994), ''The Dictionary of Symbols''. The quote beginning "Almost from prehistoric times..." is on p. 402.</ref> which is understood to refer to the extent of their powers both territorially and in terms of total control of their subjects' doings. 
*The [[Square of Opposition]], in both its Aristotelian version and its [[Square of Opposition#Modern squares of opposition|Boolean version]], consists of four forms: A ("All ''S'' is ''R''"), I ("Some ''S'' is ''R''"), E ("No ''S'' is ''R''"), and O ("Some ''S'' is not ''R''").