facmu'e lujvo

x1 is reality / "the real world" ("this" world, the world the speaker and [presumably] listener reside in), containing/defining x2 (objects and facts) defined by rules x3

See fatci (= jetnu lo facmu'e), facyza'i, facfau, munje, mu'ai

In notes:

x1 (nu) really happens / actually happens
x1 is real / really exists in this universe