This is a classic anecdote. Ying Chen invited Du Xuan to drink, and the bow hanging on the wall cast a reflection in the wine cup. Du Xuan mistook the reflection for a snake, became anxious upon believing he had swallowed a snake, and fell seriously ill. When Ying Chen learned of Du Xuan's illness, he visited him. Upon seeing the bow on the wall again, Du Xuan's illness immediately disappeared. L…