Uma is the power of Shiva, the controller of that immense power. Mother Uma Parvati, Dakshakanya Sati, Durga, Chandika, etc. are various names. In a way, Mahadevi or Mahamaya. Mahadevi is Kalika or Kali in disguise. And Shyama is in that stream. In fact, everything is power, Adi Shakti or Adyashakti. Mother Kali is an inexhaustible river flowing through the life and culture of Bengalis. 'Kali Katha' is another new addition there.