According to physics light is energy (electromagnetic) darkness is its lack. Sound is energy, silence is not. Motion is energy (kinetic) , stillness is not. Heat is energy (thermal) , coldness is not. An object with more energy is softer. For example, ice turns to water and then steam with more heat (thermal energy); so yang is actually soft, not shade/yin (the lack of energy). As and object gets colder its particles contract, pulls together and becomes still. As an object gets hotter its particles move and release expanding. So to sumarize Yang: Light Heat Motion Softness Release Yin: Darkness Coldness Stillness Solidity Contraction So it is actually cold, dark, still, heavy energies that are yin and hot, bright, moving, soft energies that are yang according to physics. So, keeping your energy gentle, warm, and spreading will keep your energy high. Notice how the lack of energy (yin) is also the symptoms of fear: chills (cold), stillness (shock from fear), and tense (contraction) and feeling safe feels the opposite. So a great way to keep your energy in a high frequency (yang/light) is to repeat the affiemation "I am safe" to keep your energy moving and free (gentle, soft, warm).
This is all according to physics, what do you guys think? Staying in this vibe of "I am safe" is high vibe and powerful and you will easily manifest what you truly want from your pure/high vibe without effort or struggle (heaviness nor slowness)