The Avataṃsaka, or Flower Ornament, Sūtra presents a cosmos in which every world and every moment contains all others. Its final book tells of the pilgrim Sudhana visiting fifty-three teachers. It inspired the Huayan school of China and much East Asian art and thought.
Avataṃsaka Sūtra
The Flower Garland Sūtra: a vast scripture of the interpenetration of all things, basis of the Huayan school.
Also: Avatamsaka, Flower Garland Sutra