Wu Collection, Middle Volume Radical: Eye (mù) 瞳 Kangxi strokes: 17 Page 818, Entry 04 Pronounced tong Pronounced tong Pronounced tong In the Jade Chapters (Yupian): The pupil of the eye. In Explanations of Names (Shiming): Pupil. Pupil means overlapping; it refers to the eyelid skin wrapping around the eyeball in layers. In Spiritual Pivot (Lingshujing): The vital essence of the bones forms the pupil. Commentary: This is the vital essence of the kidneys. Also written as the variant form tong. In Records of the Grand Historian (Shiji), Biography of Xiang Yu: Shun's eyes likely had double pupils, and Xiang Yu also had double pupils. In Book of Han (Qian Hanshu): Written as tong. In Biographies of Immortals (Shenxian Zhuan): The pupils in both eyes of Li Gen were square. The Classic of Immortals states: Those who live to eight hundred years of age will have pupils that turn square. Also refers to a blank, staring appearance. In Zhuangzi, Knowledge Wandered North: Your blank, staring appearance is like that of a newborn calf. Also pronounced chu (falling tone). In Zhuangzi, Knowledge Wandered North, Guo Commentary: Pronounced tu jiang. Li Commentary: The appearance of being ignorant and oblivious. In Correct Rhymes (Zhengyun): Also pronounced chong.