This Upanishad from Atharvana Veda has been explained in simple Tamil without confounding the first reader with higher philosophy. The Tamil title conveys the essence of the Upanishad by pointing out how we all chase the shadow, imagining it to be real!.63 verses of the Upanishad are presented in chapters such as knowledge-lower and higher, Enjoyment vs. Renunciation, Light and Lamp, Know Thyself – Shadow and Real, Realization of Divine. In addition to the commentaries of the 3 Acharyas, learned discussions on the Upanishads by learned saints of Ramakrishna order form the basis of the book. Each verse is given in Sanskrit with Tamil transliteration. Explanation in Tamil of Mundaka Upanishad is provided by Swami Asutoshananda.