Huayan Buddhism, often associated with the “Flower Garland” vision of reality, is a major school of Chinese Mahāyāna thought that takes the Avataṃsaka (Avatamsaka) or Flower Garland Sūtra as its scriptural heart. It portrays the cosmos as a single dharmadhātu, a total field of reality in which all things are mutually interdependent and interpenetrating. This vision is classically evoked through the image of Indra’s Net: an infinite web of jewels where each jewel reflects all the others, suggesting that every phenomenon both contains and reveals the whole. In this perspective, there is no ultimate separation between the absolute and the relative, between principle (li) and phenomena (shi); each concrete thing is understood as a complete expression of the totality. The school’s teachings on “perfect interfusion” and “mutual interpenetration” articulate this non-dual relationship between the one and the many, where distinct entities retain their uniqueness while simultaneously embodying the entire cosmos.

The historical emergence of Huayan lies in the Chinese reception and interpretation of the Avataṃsaka Sūtra, especially as it was translated and studied over several centuries. During the Tang dynasty, a lineage of five patriarchs shaped this material into a coherent school. Dushun is regarded as the first patriarch, laying the initial doctrinal and contemplative foundations. Zhiyan further developed these ideas into a more systematic framework. Fazang, the third patriarch, is remembered as the great systematizer of Huayan thought, articulating its key doctrines in a philosophically rigorous manner and helping to establish it as a distinct tradition. Chengguan refined and commented on these teachings, while Zongmi, both a Huayan patriarch and a Chan master, brought Huayan metaphysics into dialogue with Chan practice, giving the school a lasting influence on East Asian Buddhist spirituality.