He saw it in the way the tea seller poured the hot milk in a perfect arc. Ethilum Sivaya... Shiva is in everything.
Written by Mugilan or Veeramani Kannan , depending on the specific album arrangement.
Based on searching the term in Tamil forums and YouTube:
These are available for on iTunes or streaming on Spotify.
Engum Sivaya Ethilum Sivaya Om Nama Shivaya Om Nama Shivaya"