And chalk. There is a brand of Japanese chalk which is very popular among people who frequently use chalk. It is called Hagoromo. See: - Why mathematicians a

And chalk. There is a brand of Japanese chalk which is very popular among people who frequently use chalk. It is called Hagoromo. See: - Why mathematicians are hoarding this special type of Japanese chalk: https://gizmodo.com/why-mathematicians-are-hoarding-this-special-type-of-ja-1711008881 https://gizmodo.com/why-mathematicians-are-hoarding-this-spe... - Apparently that company was purchased from its previous owner and continues to operate: https://hagoromo.shop/ https://hagoromo.shop/