Practitioners of the Craft spoke instead of sympathy, about the thinning of thresholds between world and Nav and how the soul-effigy became eminent by straddling is and could-be. It was an intuitive answer, meant to guide the mind along thought-paths that reinforced themselves. A craft of words to make craftsmen of those who heard it.
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Captain Totec had explained it as an effect of observational solipsism, a reduction of the metaphysical impurities that came from the Material being observed by a lucent mind. It was a provable conclusion, measured and recorded and stripped clean of anything the Navigators deemed to smell of mysticism. The Akelarre wanted no uncertainty in their Signs or the principles guiding them.