Do as you would be done by: At England's London Zoo, the chimpanzees 'food trough is placed outside the bars of their enclosure, and when the apes put out their hands to grasp food, they cannot pull them in again; but at the two ends of the trough the bars are more widely spaced, and so the chimpanzees slowly push their food to the ends before retrieving it.
己所不欲，勿施於「物」英國倫敦動物園，將黑猩猩的飼料槽設在欄桿外，猩猩手伸出去抓食物，卻進不來；但動物園在食物盒兩邊留有比較寬的欄桿縫，只見猩猩將食物慢慢推到兩端再取食。