I liked the explanation of Tat and permanency of Tat. Tat becoming AUM and explaining AUM as opposite of zero is great. Analysis of AUM as the power that starts, manages and ends any cycle exactly matches with the way AUM is pronounced.
Exist, Express and Empower and Enjoy cycle of organisms is very nice and very true. Every cycle has many cycles in it, its phase and color. Purusha and Prakruti concept made lot easier to know how any relationship works. Energy vs Matter, Idea vs Expression, Do vs Get, Unknown vs Known, Functional vs Magical, Blissful vs Colorful...it made so easy to understand man and woman and importance of both for proper balance.