Let ’ s do an interesting little experiment. Hold your forefinger 10 centimeters in front of your eyes, centered between the two. In turn, close the left eye and then the right.
做個有趣的小實驗，當我們伸出食指放在兩眼正中央前方 10 公分處，輪流閉起左眼再閉起右眼，就能發現兩隻眼睛看到的景象其實有明顯差異。