With the passing of time, the alphorn almost totally disappeared as an instrument used by Swiss shepherds. It was only with the romanticism of the 19th century and the revival of folklore and tourism that the alphorn experienced a renaissance and even became a national symbol.Like the didgeridoo, the Indian bamboo or wooden trumpet and the African horn, the alphorn is one of the original wooden wind instruments. The alphorn in Switzerland was first documented in the mid-16th century by natural scientist Conrad Gesner. The alphorn has long been a tool used by shepherds. It was used to call the cows from the pastures and into the barn at milking time. An engraving from 1754 shows a shepherd using the alphorn to motivate the cows to cover the last steep stretch on their big climb up into the Alps. A glass painting from the Emmental Valley dating back to 1595 shows the alphorn being blown, probably to pacify the cows during milking. The blowing of the alphorn in the evening is also a traditional theme in art. This sound served as an evening prayer, and was mainly practiced in the Reformed cantons, while in the German-speaking Catholic cantons in Central Switzerland, the call to prayer was preferred.