Around 750 A.D., these screens were found to be a folding-type Byobu with paper hinges. In the Heian-era (784-1192), people discovered how to make gold leaf, and then put it on paper. Gold leaf Byobu became popular. Sometimes, art was added to the paper or beautiful fabric to cover these screens. Byobu is a way to exhibit art, even though they were originally believed to have been used to protect people from the wind and for privacy. The Byobu process takes a long time, consists of almost ten steps, and is not simply a paper-made panel. In the 15th and 16th centuries, before Japan closed its doors to the world, it is believed that Byobu comprised the primary Japanese export products.