Yin energy is considered feminine energy. Much like a mother's womb—yin is very nurturing, receptive, soft, and quiet. Unlike yang, yin is very slow moving and contracting—meaning it moves inward. Some common properties of yin include:
Yin can be characterized by such things
as subtle lighting, dark colors, soft and rounded
furniture, ornate patterns, and earthy colors.
An environment with an abundance of yin energy might have heavy carpeting and drapery, hushed tones, subdued or dim lighting, dark furniture, and low ceilings. Yin environments tend to feel "cave-like."

Your home has too much yin if you have any of the following symptoms: lacking leadership; low productivity; indecisive; depressed or overly emotional; controlling; overly introverted; hold on to things too long; or stagnant energy.
Hard surfaces like polished stone tables, wood or tile floors, and mirrors are perfect additions if you want more yang energy.
If you have too much yin, balance it out with some yang energy. Add bright colors and lighting (especially uplights). You can even remove your curtains and let the sunlight stream in. Include furniture and accessories that have smooth and/or glossy surfaces. You may also want to use lightweight furniture and pick stuff up off of the floor.

You can balance too much yin with yang adjustments like
hard furniture, wood floors,
bright colors, and more lighting.
Your home has too little yin if you have any of the following symptoms: hyperactivity; can't express emotions; impractical; overly extroverted; throw everything away; make poor decisions; or feel uncomfortable due to too much energy and activity.
If you need to add more yin energy to your space, then choose soft, upholstered furniture that is heavy and low to the ground. Select rich, dark colors and soft lighting. You can also bring in rounded window treatments, area rugs, and throw pillows to add that soft nurturing quality that is associated with yin.
As always, it is most important to balance yin and yang—people are always much happier in balanced environments.

If you want to add more yin to your space, try adding
heavy drapery, soft furniture, throw pillows and darker colors.
"Happiness is not a matter of intensity but of balance, order, rhythm and harmony."
- Thomas Merton
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Not sure where to start? Check out the Beginner's Guide.
Find out the 5 things you need to know before applying feng shui in the home.
Learn how to use the bagua map to improve any area of your life.
Find out how to apply feng shui room by room.
Free information on the meaning of colors and how to use them.