Intellectual life also has more of the spiral than the straight line or the circle about it… many important truths cannot be expressed explicitly or arrived at linearly, but must be, so to speak, taken by stealth. They must be disclosed from a number of different perspectives that converge, rather like following a spiral path around them.
McGilchrist argues that the spiral — not the line or the circle — is the proper formal model for both intellectual inquiry and spiritual truth, since genuine understanding requires convergent, circling approach rather than linear advance.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021thesis