Ghost drawing is easiest
The king of the state of Qi asked his guest who was drawing a picture for him, what is most difficult to draw? "Dogs and horses are the most difficult." "What is the easiest?" "Ghosts are the easiest. Dogs and horses are familiar sights that we behold from morning till evening and it is not easy to capture the likeness. That's why they are so difficult to draw. As for ghosts, they have no shape and they not appear before us. That is why it's so easy to draw them." Hanfeizi
画鬼最易
齐王问他的画师，画什么最难。画师回答说："狗和马最难画。""那什么最容易？""画鬼最容易。人们天天都能看见狗和马，所以要抓住相似处并不容易，所以难画。至于鬼，没有形状，人们也从没看见过他们，所以画鬼最容易。"《韩非子》
