Short answers, pulled from the story.
A thangka painting is a Tibetan Buddhist work on cotton or silk that depicts deities, scenes, or mandalas. Artists apply mineral and organic pigments mixed with animal glue as a water-soluble medium onto loosely woven cotton produced in widths ranging from 30 to 45 centimeters.
The earliest surviving examples of this form appear in the Mogao Caves at Dunhuang on the Silk Road in Gansu province, China. These caves served as repositories for old manuscripts and textiles sealed off in the 11th century after centuries of deposits, with many paintings dating to the period between 781 and 848 during Tang dynasty rule.
Thangkas divide into broad categories including painted forms called bris-tan and silk-based versions made via appliqué or embroidery. Painted color types known as tson-tang represent the most common variety found today while blockprints utilize paper or cloth outlined renderings created through woodcut or woodblock printing methods.
Most thangkas were intended for personal meditation or instruction of monastic students within Tibetan Buddhist practice. They serve as important teaching tools depicting Buddha life stories influential lamas deities and bodhisattvas while functioning as objects of merit-making when commissioned by individuals who believed acquiring spiritual benefits through their creation.
Tibetan painting balanced between two major influences: Indo-Nepalese traditions and Han Chinese styles despite Buddhism declining in those regions. From the 14th century onward, more space and emphasis appeared on landscape backgrounds reaching peak development during the 18th century after Giuseppe Tucci noted that Qing dynasty court interest produced refined elegant works sent to Tibet influencing local styles.