The sky's a plain

from Mellowhype – Primo Lyrics on Rap Genius

Meaning

Play on the word plane\plain. In a literally context of this line — more logical, that’s here — plain.
Bur in the weed-context of whole song — off course plane, a joint. As.. this plane, bird, clouds and shy — it was just his imagination. (by reason of maryjuanna)

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