In the fourth set of images we see anatomical images of the Sea of Qi taken from a tradition attributed to Hua Tuo, a renowned physician of the 3rd century CE, here in 4a) a Qing dynasty (1636-1911) copy. It travelled west to be copied into 4b) Tansūqnāma-i Īlkhan dar funūn-i ‘ulūm-i khatā’ Ī (The Treasure Book of the Ilkhan on Chinese Science and Techniques), dated AH 713 (1313). Rashīd al-Dīn, Tabriz, 1313, fol. 66b. The Persian manuscript contains the earliest extant medical images copied from a number of lost Chinese sources. The Sea of Qi is mapped on to the diaphragm reflecting a sensory world of alchemical practice grounded in anatomical observation. What attributes of this image facilitated its travel to Japan and Persia? Cross-reference: The Sea of qi and the diaphragm