A 17th century Central Tibetan thangka (painted or embroidered banner) of Guhyasamaja Akshobhyavajra, from the Guhyasamāja tantra, a tantra whose practice is important to many schools of Tibetan Buddhism. The Guhyasamaja (“Secret Assembly”) tantra was developed at an early date in history to aid the Buddhist practitioner in understanding and practicing Tantric Buddhism to attain enlightenment. These are the basic texts of the Tantric—an esoteric and highly symbolic—form of Buddhism, which developed in India and became dominant in Tibet.

en.wikipedia.org/wiki/Image:17th_century_Central_Tibeten_thanka_of_Guhyasamaja_Akshobhyavajra,_Rubin_Museum_of_Art.jpg