The “Art Boards” are called shitajiki in Japanese, and are used to provide stability while writing in a notebook (similar to the way that clip boards are used in the West). Unlike the shitajiki that are sold in stationery shops, however, those pictured in this thread are made of cardboard. I’ve posted a few other shitajiki in my collection roundup: www.elitefourum.com/t/from-the-japanime-vault-updated-october-24-2021/11101/19
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