FROM WIKIPEDIA EN
A thangka, also known as tangka, thanka or tanka (Nepali pronunciation: [ˈt̪ʰaŋka]; Tibetan: ཐང་ཀ་; Nepal Bhasa: पौभा) is a painting on cotton, or silk appliqué, usually depicting a Buddhist deity, scene, or mandala of some sort. The thankga is not a flat creation like an oil painting or acrylic painting but consists of a picture panel which is painted or embroidered over which a textile is mounted and then over which is laid a cover, usually silk. Generally, thangkas last a very long time and retain much of their lustre, but because of their delicate nature, they have to be kept in dry places where moisture won't affect the quality of the silk. It is sometimes called a scroll-painting.
These thangka served as important teaching tools depicting the life of the Buddha, various influential lamas and other deities and bodhisattvas. One subject is The Wheel of Life, which is a visual representation of the Abhidharma teachings (Art of Enlightenment).
Thangka, when created properly, perform several different functions. Images of deities can be used as teaching tools when depicting the life (or lives) of the Buddha, describing historical events concerning important Lamas, or retelling myths associated with other deities. Devotional images act as the centerpiece during a ritual or ceremony and are often used as mediums through which one can offer prayers or make requests. Overall, and perhaps most importantly, religious art is used as a meditation tool to help bring one further down the path to enlightenment. The Buddhist Vajrayana practitioner uses a thanga image of their yidam, or meditation deity, as a guide, by visualizing “themselves as being that deity, thereby internalizing the Buddha qualities (Lipton, Ragnubs).”
Historians note that Chinese painting had a profound influence on Tibetan painting in general. Starting from the 14th and 15th century, Tibetan painting had incorporated many elements from the Chinese, and during the 18th century, Chinese painting had a deep and far-stretched impact on Tibetan visual art. According to Giuseppe Tucci, by the time of the Qing Dynasty, "a new Tibetan art was then developed, which in a certain sense was a provincial echo of the Chinese 18th century's smooth ornate preciosity."
Thangka is a Nepalese art form exported to Tibet after Princess Bhrikuti of Nepal, daughter of King Lichchavi, married Songtsän Gampo, the ruler of Tibet  imported the images of Aryawalokirteshwar and other Nepalese deities to Tibet. History of thangka Paintings in Nepal began in 11th century A.D. when Buddhists and Hindus began to make illustration of the deities and natural scenes. Historically, Tibetan and Chinese influence in Nepalese paintings is quite evident in Paubhas (Thangkas). Paubhas are of two types, the Palas which are illustrative paintings of the deities and the Mandala, which are mystic diagrams paintings of complex test prescribed patterns of circles an square each having specific significance. It was through Nepal that Mahayana Buddhism was introduced into Tibet during reign of Angshuvarma in the seventh century A.D. There was therefore a great demand for religious icons and Buddhist manuscripts for newly built monasteries throughout Tibet. A number of Buddhist manuscripts, including Prajnaparamita, were copied in Kathmandu Valley for these monasteries. Astasahas rika Prajnaparamita for example, was copied in Patan in the year 999 A.D., during the reign of Narendra Dev and Udaya Deva, for the Sa-Shakya monastery in Tibet. For the Nor monastery in Tibet, two copies were made in Nepal-one of Astasahasrika Prajnaparamita in 1069 A.D. and the other of Kavyadarsha in 1111 A.D. The influence of Nepalese art extended till Tibet and even beyond in China in regular order during the thirteenth century. Nepalese artisans were dispatched to the courts of Chinese emperors at their request to perform their workmanship and impart expert knowledge. The exemplary contribution made by the artisans of Nepal, specially by the Nepalese innovator and architect Balbahu, known by his popular name Araniko bear testimony to this fact even today. After the introduction of paper, palm leaf became less popular, however, it continued to be used until the eighteenth century. Paper manuscripts imitated the oblong shape but were wider than the palm leaves.
From the fifteenth century onwards, brighter colours gradually began to appear in Nepalese.Thanka / Thangka. Because of the growing importance of the Tantric cult, various aspects of Shiva and Shakti were painted in conventional poses. Mahakala, Manjushri, Lokeshwara and other deities were equally popular and so were also frequently represented in Thanka / Thangka paintings of later dates. As Tantrism embodies the ideas of esoteric power, magic forces, and a great variety of symbols, strong emphasis is laid on the female element and sexuality in the paintings of that period.
Religious paintings worshipped as icons are known as Paubha in Newari and Thanka / Thangka in Tibetan. The origin of Paubha or Thanka / Thangka paintings may be attributed to the Nepalese artists responsible for creating a number of special metal works and wall- paintings as well as illuminated manuscripts in Tibet. Realizing the great demand for religious icons in Tibet, these artists, along with monks and traders, took with them from Nepal not only metal sculptures but also a number of Buddhist manuscripts. To better fulfil the ever - increasing demand Nepalese artists initiated a new type of religious painting on cloth that could be easily rolled up and carried along with them. This type of painting became very popular both in Nepal and Tibet and so a new school of Thanka / Thangka painting evolved as early as the ninth or tenth century and has remained popular to this day. One of the earliest specimens of Nepalese Thanka / Thangka painting dates from the thirteenth /fourteenth century and shows Amitabha surrounded by Bodhisattva. Another Nepalese Thanka / Thangka with three dates in the inscription (the last one corresponding to 1369 A.D.), is one of the earliest known Thanka / Thangka with inscriptions. The "Mandalaof Vishnu " dated 1420 A.D., is another fine example of the painting of this period. Early Nepalese Thangkas are simple in design and composition. The main deity, a large figure, occupies the central position while surrounded by smaller figures of lesser divinities.
Thanka / Thangka painting is one of the major science out the five major and five minor fields of knowledge. Its origin can be traced all the way back to the time of Lord Buddha. The main themes of Thanka / Thangka paintings are religious. During the reign of Tibetan Dharma King Trisong Duetsen the Tibetan masters refined their already well-developed arts through research and studies of different country's tradition. Thanka painting's lining and measurement, costumes, implementations and ornaments are mostly based on Indian styles. The drawing of figures is based on Nepalese style and the background sceneries are based on Chinese style. Thus, the Thanka / Thangka paintings became a unique and distinctive art. Although the practice of thanka painting was originally done as a way of gaining merit it has nowadays only evolved into a money making business and the noble intentions it once carried has been diluted. Tibetans do not sell Thangkas on a large scale as the selling of religious artifacts such as thangkas and idols is frowned upon in the Tibetan community and thus non Tibetan groups have been able to monopolize on its (thangka's) popularity among Buddhist and art enthusiasts from the west.
Thanka / Thangka have developed in the northern Himalayan regions among the Lamas. Besides Lamas, Gurung and Tamang communities are also producing Tankas, which provide substantial employment opportunities for many people in the hills. Newari Thankas (Also known as Paubha) has been the hidden art work in Kathmandu valley from 13th century. We have preserved this art and are exclusively creating this with some particular painter family who have inherited their art from their forefathers. Some of the artistic religious and historical paintings are also done by the Newars of Kathmandu Valley.
Based on technique and material, thangkas can be grouped by types. Generally, they are divided into two broad categories: those that are painted (Tib.) bris-tan—and those made of silk, either by appliqué or embroidery.
Thangkas are further divided into these more specific categories:
Whereas typical thangkas are fairly small, between about 18 and 30 inches tall or wide, there are also giant festival thangkas, usually Appliqué, and designed to be unrolled against a wall in a monastery for particular religious occasions. These are likely to be wider than they are tall, and may be sixty or more feet across and perhaps twenty or more high.
Somewhat related are Tibetan tsakli, which look like miniature thangkas, but are usually used as initiation cards or offerings.
Because Thangkas can be quite expensive, people nowadays use posters of Thangkas as an alternative to the real thangkas for religious purposes.
Thangkas are painted on cotton or silk. The most common is a loosely woven cotton produced in widths from 40 to 58 centimeters (16 - 23 inches). While some variations do exist, thangkas wider than 45 centimeters (17 or 18 inches) frequently have seams in the support. The paint consists of pigments in a water soluble medium. Both mineral and organic pigments are used, tempered with a herb and glue solution. In Western terminology, this is a distemper technique.
The composition of a thangka, as with the majority of Buddhist art, is highly geometric. Arms, legs, eyes, nostrils, ears, and various ritual implements are all laid out on a systematic grid of angles and intersecting lines. A skilled thangka artist will generally select from a variety of predesigned items to include in the composition, ranging from alms bowls and animals, to the shape, size, and angle of a figure's eyes, nose, and lips. The process seems very methodical, but often requires deep understanding of the symbolism involved to capture the spirit of it.
Thangka often overflow with symbolism and allusion. Because the art is explicitly religious, all symbols and allusions must be in accordance with strict guidelines laid out in Buddhist scripture. The artist must be properly trained and have sufficient religious understanding, knowledge, and background to create an accurate and appropriate thangka. Lipton and Ragnubs clarify this in Treasures of Tibetan Art:
“Tibetan art exemplifies the nirmanakaya, the physical body of Buddha, and also the qualities of the Buddha, perhaps in the form of a deity. Art objects, therefore, must follow rules specified in the Buddhist scriptures regarding proportions, shape, color, stance, hand positions, and attributes in order to personify correctly the Buddha or Deities.”