Psychology = Pisces is the Virtue & principal of dreams & imagination; the feminine side of Jupiter rules it, this energy makes you like to receive meaning & reasoning from the external world to get a sense of wisdom, and when you add Neptune, this makes you want to add all meaning and reasoning to your dreams & imaginations. Therefore as a “Spirit/Observer,” you know that you are using the feminine side of Jupiter & Neptune/12 house when you start thinking about your dreams & illusions. The mutable quality in the Pisces aspect can manifest as multiple layers of Skin (Epidermis/Melanocytes/Langerhans Cells) and their many functions. Also, Pisces’ power to create illusion could be seen in how the skin/integument system cover-up or acts as an illusion that covers your body organs/bodily system.
Physiology = The skin and accessory structures perform a variety of essential functions, such as protecting the body from invasion by microorganisms, chemicals, and other environmental factors; preventing dehydration; acting as a sensory organ; modulating body temperature and electrolyte balance; and synthesizing vitamin D. The underlying hypodermis has important roles in storing fats, forming a “cushion” over underlying structures, and providing insulation from cold temperatures.