 First, Kant directly discusses what he intends by “world” in the Critique of Pure Reason where he explains to readers that he will be using “nature” to refer to “the unity in the existence of appearances” (A419/B447) versus “world”, which has a “transcendental sense”, such that when dealing with cosmological ideas, “world” goes beyond just the phenomenal to the “sum total of existing things” (A419/B447).