The speaker feels pulled between two extremes. One is the crowded, noisy surface of the Earth, where voices "sting" and "spin." The other is the vast quiet of the cosmic voids, the empty spaces around galaxies, where gas gathers to make new stars. The speaker says they live in both places at once, with one "pole" at the Earth's core and another in the great voids. Like a magnet, these poles "flip," which suggests moods or states of mind that can reverse without warning.
The refrain at the start and end, "in the boiling roiling plasma of mind, / but few things ever come to ground...", frames the whole poem. Thoughts churn like superheated gas, and very few settle or become solid. The mood is restless and dizzy, but there is also a strange wonder in it. The emptiness isn't only bleak, since it holds the raw material for new stars. The poem suggests a mind that is overwhelmed and unmoored, yet also vast and creative.