Cloth has been used to cover billiards tables since the 15th century (1400s). In fact, the company that became the most famous maker of billiard cloth, Iwan Simonis, was formed in 1453. Most cloth made for carom billiards tables is a type of cloth called "baize" that is dyed green in color, and is made from 100% wool that has fibers that are made to be very straight (a process called worsting). Baize cloth provides a very fast surface allowing the balls to travel easily across the table material, called a "bed". The green color of cloth was originally chosen to look similar to grass. Green has been the common cloth color since the 16th century (1500s). However, the color also serves a useful function. Human eyes more easily see green than any other color. This allows players to keep playing for longer periods of time without straining their eyes.