Dream Pool Essays
In 1193, Zhou Bida, an officer of Southern Song Dynasty, made a set of clay movable-type method according to the method described by Shen Kuo in his "Dream Pool Essays", and printed his book "Notes of The Jade Hall" (). The ceramic movable type was also mentioned by Kublai Khan's counsellor Yao Shu, who convinced his pupil Yang Gu to print language primers using this method.