I think "4" might be mystical to them also because way back in the day, the whole of existence could be broken down to the 4 elements, Earth, Wind, Fire, and Air.
yep. lots of different cultures attach different important elemental symbolism to cardinal direction.
Chinese -
North = Rat: Adaptability, charm, creativity, sociability, wit.
East = Rabbit: Trust, sincerity, love, compassion.
South = Horse: Physical strength, health, adventure, loyalty.
West = Rooster: Confidence, business, energy, persistence.
Celtic-
East = air, communication, new beginnings, new growth
South = fire, energy, passion, creativity
West = water, emotion, psyche, movement
North = earth, home, security, fertility
North = Infinite Possibility (no-time)
South = Present – Now
West = Past
East = Future
American Indian-
North = wisdom/thought
East = salvation/spirit
South = beginnings/purity
West = conclusions/fullness