In this frigid fragile capsule
That allows you to fly south before the winter winds trap you
Vast is talking about the body (the “capsule” for the soul), building on a common theme from the album. Pigeons have bodies that let them fly to warm weather, but only for so long: like us, they’re “fragile,” mortal, destined to be trapped by the “winter winds” and become empty, “frigid” corpses.
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