Body and soul... More to the point about referring to the void. It seems that what you are actually trying to convey is the idea of space, or spaciousness, that which contains and envelopes all forms, which to me means something quite different from 'the void', which perhaps pervades all forms. But all this can be very subjective of course.
So I must concur with T Clark. If the intention here is not to be philosophically exacting, but rather to be poetically allegorical, then it may be best to avoid the tendency to over analyze, as it becomes like dissecting an intricate and lovely insect to discover what makes it so, and in the process destroying it. Sure, terms like 'soul' can be ambiguous, nebulous and mystical; but poetry surely must allow for some subjective and intuitive leeway in interpretation. So go with what intuitively and integrally feels right to you, as your heartfelt expression, and let the interpreters read into it what they may.