The emerging conjecture here is that the odd numbers are so called because they are liminal and not formal. They are transformative stages along the ordinal narrative, neither here nor there.
In the Tarot , 0 represents the Fool, the beginning and end of the Major Arcana. The Fool’s journey commences in ethereal bliss, untethered to the material world and its mores. As the Fool traverses the Arcana , the life journey becomes increasingly consequential and complex in character. Eventually, complete knowledge of the bounds within Universe re-liberates the courageous sojourner by integrating them into Universal flow. The traveler is once again the Fool, though now a wise one. The reborn Fool need not contemplate the laws of Universe because they have together become consummate.