This tree is considered sacred by Hindus and Buddhists. The Banyan represents eternal life or immortality.
Many plants and animals are considered sacred by Hindus. It is significant that Hinduism takes in its fold all life forms, not just human beings. That is why in India we still have wildlife which has long been destroyed in western countries. You can read about it here. Worshipping trees, plants and animals is a healthy way to preserve our beautiful planet and this great religion does that. Unfortunately this reverence for plants and animals is fast eroding in modern India.
More pictures of bonsai plants: Chapha the tropical flower, Plumeria in English or Bougainvillea Bonsai or Bonsai of the Banyan tree or a difficult to make Plaited Bonsai Plant