That was the first Chapter, where the ground was being cleared. Yes, Frye presupposes a nonlinguistic world, exemplified by the concept of five, also named funf, cinco, besh, and so on. These are real, but are not things. Because words can create things.
Poets are the lawgivers of the ages.
The idea of the pyramids created the pyramids. Without language and imagination, we would live in the natural world. With language, we live in a cultural world, shaping the natural world to human meanings. Mankind lives within its symbols. The divided line.