The oldest source on incense is the Vedas, specifically, the Atharva-veda and the Rigveda, which set out and encouraged a uniform method of making incense. Although Vedic texts mention the use of incense for masking odours and creating a pleasurable smell, the modern system of organized incense-making was likely created by the medicinal priests of the time. Thus, modern, organized incense-making is intrinsically linked to the Ayurvedic medical system in which it is rooted. The method of incense making with a bamboo stick as a core originated in India at the end of the 19th century, largely replacing the rolled, extruded or shaped method which is still used in India for "dhoop" and cones, and for most shapes of incense in Nepal/Tibet and Japan. Other main forms of incense are cones and logs and benzoin resin (or "sambrani"), which are incense paste formed into pyramid shapes or log shapes, and then dried.