complete loss of the injunctive. The Brahmana part ('commentary' on mantras and ritual) of the Black Yajurveda (MS, KS, TS) belongs to this period. Archaeologically, the Painted Grey Ware culture from c. 1000 or 900 BCE corresponds to the Kuru Kingdom and the subsequent eastward shift of the political centre from the Kurus to the Panchalas on the Ganges. Brahmana prose texts: The Brahmanas proper of the four Vedas belong to this period, as well as the Aranyakas, the oldest of the Upanishads (BAU, ChU, JUB) and the oldest Śrautasutras (BSS, VadhSS). In the east, Videha (N. Bihar and Nepal) is established as the third main political centre of the Vedic period. Sutra language texts: This is the last stratum of Vedic Sanskrit leading up to c. 500 BCE, comprising the bulk of the Śrauta and Grhya Sutras, and some Upanishads (e.g. KathU, MaitrU). Visual arts In northern India, some very early depictions of deities appear in the art of the Indus Valley civilisation, but the following millennium, coinciding with the Indo–Aryan migration during the Vedic period, is devoid of such remains. It has been suggested that the early Vedic religion focused exclusively on the worship of purely "elementary forces of nature by means of elaborate sacrifices", which did not lend themselves easily to anthropomorphological representations. Various artefacts may belong to the Copper Hoard culture (2nd millennium CE), some of them suggesting anthropomorphological characteristics. Interpretations vary as to the exact signification of these artifacts, or even the culture and the periodization to which they belonged. Some examples of artistic expression also appear in abstract pottery designs during the Black and red ware culture (1450–1200 BCE) or the Painted Grey Ware culture (1200–600 BCE), with finds in a wide area, including the area of Mathura. Archaeology Archaeological cultures identified with phases of Vedic material culture include the Ochre Coloured Pottery culture, the Gandhara Grave culture, the Black and red ware culture and the Painted Grey Ware culture. Ochre coloured pottery culture was first found approximately between 1950 and 1951, in western Uttar Pradesh, in the Badaun and Bisjuar district. It is thought that this culture was prominent during the latter half of the 2nd millennium, within the transition between the Indus Valley civilization and the end of Harrapan culture. This pottery is typically created with wheel ware, and is ill-fired, to a fine to medium fabric, decorated with a red slip,