Rahu and Ketu are generally denoted as top graded malefic withoit having any physical appearance but possess shadowy existence in our planetary system.
Rahu is said to represent the high level of desires, urges and hunger for name fame and success. Rahu is demons head which consists of brain, whereby Rahu controls over our brain and influence thought process whether it could be at the wronger or right side.
Whereas Ketu is the dark side of life and Ketu is said to detach a person from his affiliations or belongins. Ketu generally gives detachment from the world pleasures, urge of learning, spirituality and force us to take decisions from the hear not from brain, because ketu is headless and it signifies lower part of the body below neck where heart is situated.
The major difference between of Rahu and Ketu is demands and sacrifice, similarly Rahu wants everything but Ketu wants nothing, like big brother who always sacrifice for the younger brother. Whereas Rahu is just like a mean friend or person who wants only benefits of own.
Whenever you juggles in choosing the right decisions both mind and heart creates duality and lead you in to the limbo, this is the clear cut example of Rahu and Ketu’s influence.
Thanks
Acharya Subhash Sharma