Introduction

The ancient Chinese believed that all transformations happened under the influence of Qi. Everything from conception, birth, the process of aging, to death is influenced Qi as well as everything between Heaven and Earth. Qi is constantly vibrating in energetic motion in all things and is the basis that everything relates and interrelates with in the universe. Ancient Chinese believed that the Qi of Yin and Yang fulfills the "Great Void" (Wuji), enveloping all things and leaving nothing outside its boundary.
The ancient Chinese mastered specific techniques to balance and harmonize the body's Qi, thus creating harmony with the environmental and heavenly (universal) Qi. The Qi is stored in the body in forms of energetic pools, creating the energetic matrix of the internal organs. From these internal pools, The body's life-force energy flows in the form of rivers and streams. These pools reside in the organs while the rivers and streams take form of the meridians and channels of the organs in the energetic anatomy.

Energetic Concept

Matter progresses into energy and energy to spirit, and vice-versa. Qi is considered the medium between matter and spirit. Qi has mass, the same way that smoke or vapor has mass. Qi as energy can manifest within the body through three primary levels:
-Matter: Matter energetically manifests through the body's cells and tissues in the form of Jing(essence), Morrow, Blood, and Body fluid.
-Resonant Vibrations: Energetically manifesting through heat, sound, light and electromagnetic fields.
-Divine Light/Universal light: Energetically manifesting through subtle vibrations which extend through Wuji (infinite space) to the Dao.
Each individual has three bodies, the physical body, energetic body, and the spirit body. By practicing Qigong a practitioner seeks to energize and enhance these bodies. The Physical body is the most obvious to strengthen, The energy body is strengthened by imagination and sensation, and the spirit body is strengthened by intention and attention.

Energetic Vibration of Organs

Chinese Qigong Masters discovered that each internal organ within the human body has a different function and a different speed of energetic vibration. The organs are divided into two primarty types of internal organs (yin and yang).
Yin / Yang organs
-Liver / Gall Bladder
-Heart / Small Intestine
-Spleen / Stomach
-Lungs / Large Intestine
-Kidneys / Urinary Bladder
The energetic vibration of an organ is related to the emotions of the body divided into two primary sets of emotions known as the Hun (housed in the liver and represents the benevolent nature) and the Po (housed in the lungs and represents the animal nature). Because each organ has its own speed, energetic vibration, and frequency, each organ is associated with its own element and own emotions separate from the other organs. Each organ (the location of influence) has a hun and po side to them as followed:
Hun / Po of the Organs
-Liver(wood): Love, Compassion, Patience / Irritability, Anger, Jealousy
-Heart(fire): Order, Peace, Boundary-Setting / Excitement, Nervousness, Shock
-Spleen(earth): Trust, Honesty, Virtue / Worry, Obsessiveness, Suspicion
-Lung(metal/wuji*): Integrity, Righteousness, Dignity / Grief, Sorrow, Anxiety
-Kidneys(water): Wisdom, Clear Perception, Self-confidence / Fear, Loneliness, Insecurity

*In Qigong they refer to the Lungs of being the Metal element while in Daoist traditions they refer to the Lungs as being Wuji element.

Application of Energetic Movement

There are many methods of energetic movement: Taiji, Bagua, Xingyi, Qigong, etc... that people use to strengthen, energize, and enhance their energy field though imagination and sensation during a energetic moving meditation. Through methods of energetic movement such as Taiji, Bagua, Xingyi or any other internal art, a practitioner will strengthen the three bodies (physical, energetic, spiritual) and feed the organs energy. Because of this type of practice the most deficient or insufficient organ will be fed energy first, but through qigong practice a practitioner learns to manually take control over one's constitution and logically and clinically balance their organ energies and emotions. This is why it is important to understand qigong before dabbling in any internal or energetic martial art such as Taiji, bagua, or xingyi.
In general terms, organs can be either excess or deficient resulting in illnesses and unbalanced emotions or emotional disharmony. For a skilled Qigong practitioner this is altered through specific motions, colors, and sounds depending on the condition. Because each organ vibrates on a different frequency, speed, and energetic vibration the colors and sounds applied to each organ differ.
To feed a deficient or insufficient organ one imagines inhaling specific colors as followed:

-Liver(wood): Blue Green (like the color of pine needles)
-Heart(fire): Red (like the color of a rose)
-Spleen(earth): Yellow (like the color of wheat grass)
-Lung(metal/wuji): White (like the color of clouds)
-Kidneys(water): Dark Blue (like the color of midnight or the blue of the sky during sunset)

To purge excess energies from the organs the practitioner must use sound to vibrate the organ tissues which hold the emotions on a physical, emotional, and spiritual level. There are different sounds to purge and release excess energies that affect the individual emotionally described as followed:

-Liver(wood): Shuuu(high flat to low tone), or Guo (a clinical deep toned sound used for cancer patients for its strong vibration and purging effect)
-Heart(fire): Haa (descending, often accompanied with pulling down the heavens)
-Spleen(earth): Whoo or Ho (deep tone vibrating from the spleen area)
-Lung(metal/wuji): Shhh, Sss, or Shang (vibrating from chest and inside arms along channels)
-Kidneys(water): Chree, Fu, Yu (higher tone to vibrate lower back area)

*Note that practitioners may vibrate these tones from the throat rather than the body if they are holding suppressed emotions in the body. By vibrating not from the organ and from the throat, a practitioner avoids feeling and healing from emotions. Though the practitioner will experience a clearing out of emotions such as crying, anger outbursts, depression, fear, worry, shock, etc... The practitioner enhances their energetic potential by healing from emotions and clears themselves of any energetic/emotion cause of illness and disease.

Sources:

Johnson, Jerry Alan. Chinese Medical Qigong Therapy. vol. 1. Pacific Grove: The International Institute of Medical Qigong, 2005. Print.