The Shadow Self : Rahu-Ketu axis holds a significant place as it reveals the unresolved issues being carried forward from past lives. As they are the nodes of the Moon hence their impact is always on our manosthiti, they represent our Shadow selves, the hidden parts of our being which keep on troubling if not resolved. Rahu-Ketu axis holds the potential of significant transformation wherever placed in the chart as they represents Karmic challenges and Lessons which are to be confronted in life. If they get conjuncted with Luminaries or Ascendent then it becomes even more prominent placement.

Ketu is the South node of the Moon, represents the Deep rooted and Hidden aspects of life. It is the planet of Mysticism, Detachment, Spirituality, Renunciation and It represents the dual nature : Destruction (as co rules the sign Scorpio) and Liberation (Karka for 12th House). It is not a planet of worldly matters but instead it focuses on Inner Wisdom, Higher Purpose and Self Realisation. Rules over Sixth Sense, whereas our other Five senses are to experience material reality, Sixth sense functions on another realms.
Ketu in Water signs (Cancer, Scorpio, Pisces) can give strong Intuitive abilities. In Air Signs (Gemini, Libra, Aquarius) it gives a strong sense of Detachment. Whereas in Earthy Signs (Taurus, Virgo, Capricorn) it focuses on Material detachment, Although other considerations of chart are also important to be looked at.
Moon-Ketu combination can give a unique level of intuition, it gives deep understanding of subconscious mind and unique psychic abilities that goes beyond the physical realm.

Ketu’s energy can be intense and unpredictable as it deals with Metaphysical world, holds the ability to transcend the material reality. It shatters the illusion of identity, and to recognise the nature of our essential being, it questions true nature of yourself. It is also associated with Spiritual Awakening, which is a next natural stage of Humen development. It teaches that the true understanding of self-actualisation cannot be provided by worldly matters, Substances or Relationships but it can only be understood through our inner wisdom.

Triangle is associated with Ketu which is a Universal symbol of Energy. Three states of consciousness : The Subconscious, Concious and Superconsciousness. Ketu helps us to drop down the false ego and awakes the self from slavery of senses and take us to the true liberation. it bridges the gap between Physical & Spiritual worlds and guides toward spiritual growth and self realisation. It is not necessary that Ketu will give spiritual experiences to everyone, it depends on overall significations of the chart and conjunctions.

Our Endocrine system is to be associated with Ketu, which is responsible for creating and releasing Hormones to maintain bodily functions. Which includes
Thyroid gland : which regulates Metabolism, growth and development.
Pituitary Gland : It controls the production of Hormones in other glands.
Parathyroid Gland : Regulates Calcium levels in the blood.
Adrenal : Produces Hormones that helps Blood pressure and stress response.
and Pineal Gland : Which produces Melatonin, which regulates sleep-wake cycles and is also associated with Spirituality and Intuitiveness.

Dogs are also to be associated with Ketu. Compared to humans, dogs possess a superior sense of smell and hearing, but inferior visual acuity. Dogs can feel even small variations in Earth’s Magnetic Field. Ketu’s energy is instinctive, subtle and intuitive through which one can understand the shadow self. The hidden parts, where Rahu is the Lock but Ketu is the Key. Ketu’s energy is required to balance out the Rahu’s energy and through understanding their interplay one can navigate the Deep rooted issues and Past life Karma.