What is the rectangular wood lacquer board in Japan used for?

Rectangular wood lacquer boards in Japan are used to make handicrafts, which can be used for display and appreciation. The resin of Rhus verniciflua is repeatedly coated on the surface of utensils or materials such as wood, bamboo or paper to make daily utensils, which are called "lacquerware". It is said that the history of Japanese lacquerware is about 6,500 years ago, and it can also be traced back to the early rope age 9,000 years ago. In the early days, the resin of lacquer tree was refined and added with red pigment to make red lacquerware, which was used as personal decoration or funerary objects in tombs. After entering the yayoi era about 2300 years ago, people added black ash made of pine, sesame oil and rapeseed oil to the materials of lacquerware, so black lacquerware appeared. Most of these lacquerware are used as weapons. After Buddhism spread to Japan, lacquerware was also used in various Buddhist utensils.