Inward and outward

My Guru, Sadhguru Jaggi Vasudev, says that we do not really know which way is up or which way is down;  there is only inward and outward.  This is a perfect reflection of yin and yang where yang is the inward or contracting force and yin is the outward or expanding force.  So yang force manifests as substances which are contracted such as rock, metal, hard wood, dense foods like egg yolk, etc.  Yin force manifests as expanded or expanding elements such as air, water, alcohol, large plants, etc.  These two forces try to balance with each other in every manifestation.  Without this balance the cosmos would be chaos.