Satva is: on the material plane, light, transparent, with upward motion. On the mental plane, buoyant and cheerful, with true perception, spiritual. Rajas is: on the material plane, constantly moving, translucent, with motion on the same plane, without levity or gravity. On the mental plane, constantly active, partly joyful, partly sorrowful, with partially true and partially false perception, intellectual. Tamas is: on the material plane, heavy, opaque, with downward motion. On the mental plane indolent, melancholy, nonperceptive or dull. The centripetal force is the action of Tamas and is connected with materiality. The centrifugal force is the action of Satva and is connected with spirituality. Of the seven Dvipas, the central is the Jambudvipa, which is the most material. The one farthest from the centre is the Pushkara Dvipa. The spaces intervening between the layers or Dvipas are the seven oceans. They partake of the characteristics of the Dvipas, which they respectively surround. Thus the salt ocean surrounding the Jambu Dvipa is the most material. The materiality is indicated by the word "salt," which implies gross matter. Priyavrata, it is said, went seven times round Meru, and at the time of each rotation, one ocean and its corresponding Dvipa were formed. But when the Dvipas and the oceans were all formed that particular motion of the whole system was lost. Since then days and nights are solely caused by the motion of the sun round Meru along the Manâsottara range. The seven Dvipas may be the Globes A, B, C, D, E, F, and G of Theosophical literature. The rulers of these seven Globes are seven sons of Priyavrata, named after Agni or Fire. Agni is here the form-giving Energy of each Globe. Of the ten sons of Priyavrata, seven only became Rulers of the Globes, but the other three Kavi, Mahavira and Savana, had nothing to do with the creative process. They are highly spiritual entities beyond the plane of the seven Globes. The daughter of Priyavrata was Urjasvati. The word means full of Energy. She was wedded to Sukra, the presiding god of the planet Venus. Her daughter is the renowned Devayâni, who was married to King Yayâti. She stands for Devayâna, the Radiant Path of the Upanishads, which transcends the Trilokî. Of the sons of Priyavrata, we of Jambu Dvipa or Globe D are directly concerned with Âgnidhra, who presided over its earliest destinies. The Bhâgavata does not relate the genealogy of the other sons as at present we have nothing to do with the life-evolution on these globes. The process of materialisation is indicated by the Jada state of Âgnidhra on seeing the Apsaras Pûrvachitti.