Beneath the mosses
With a plan to tunnel past after the rains have run their courses

from Aesop Rock – Commencement (at the Obedience Academy) Lyrics on Rap Genius

Meaning

In keeping with the previous metaphors of plant growth as the act of creating meaningful hip-hop.

“Mosses” is also one vowel off from “masses”. Aes likes to do this as evidenced by Tetris references in “Tetra” + others. He is saying that he stayed underground, out of the mainstream, and under the masses even though he has the skill to be the most popular.

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