I once read that an ancestor of ours evolved to have its head rotated 90' relative to its body (like a flatfish or something), but then later when it evolved a

I once read that an ancestor of ours evolved to have its head rotated 90' relative to its body (like a flatfish or something), but then later when it evolved a normally aligned head again, instead of twisting back 90' the way it had come it just twisted another 90'degrees