the energy of this time.....

"This cosmic dance of Shiva is called 'Anandatandava,' meaning the Dance of Bliss, and symbolizes the cosmic cycles of creation and destruction, as well as the daily rhythm of birth and death. The dance is a pictorial allegory of the five principle manifestations of eternal energy — creation, destruction, preservation, salvation, and illusion. "


A Scientific Metaphor:
"Fritzof Capra in his article "The Dance of Shiva: The Hindu View of Matter in the Light of Modern Physics," and later in the The Tao of Physics beautifully relates Nataraj's dance with modern physics. He says that "every subatomic particle not only performs an energy dance, but also is an energy dance; a pulsating process of creation and destruction…without end…For the modern physicists, then Shiva's dance is the dance of subatomic matter. As in Hindu mythology, it is a continual dance of creation and destruction involving the whole cosmos; the basis of all existence and of all natural phenomena." http://hinduism.about.com/od/lordshiva/p/nataraj.htm