“Sultan (Kohler's Chimpanzee) is alone in his pen. He is hungry: the food that used to arrive regularly has unaccountably ceased coming.
“The man who used to feed him and has now stopped feeding him stretches a wire over the pen three meters above ground level, and hangs a bunch of bananas from it. Into the pen he drags three wooden crates. Then he disappears, closing the gate behind him, though he is still somewhere in the vicinity, since one can smell him.
“Sultan knows: Now one is supposed to think. That is what the bananas up there are about. The bananas are there to make one think, to spur one to the limits of one's thinking. But what must one think? One thinks: Why is he starving me? One thinks: What have I done? Why has he stopped liking me? One thinks: Why does he not want these crates any more? But none of these is the right thought. Even a more complicated thought—for instance: What is wrong with him, what misconception does he have of me, that leads him to believe it is easier for me to reach a banana hanging from a wire than to pick up a banana from the floor?—is wrong. The right thought to think is: How does one use the crates to reach the bananas?
“Sultan drags the crates under the bananas, piles them one on top of the other, climbs the tower he has built, and pulls down the bananas. He thinks: Now will he stop punishing me?
“The answer is: No. The next day the man hangs a fresh bunch of bananas from the wire but also fills the crates with stones so that they are too heavy to be dragged. One is not supposed to think: Why has he filled the crates with stones? One is supposed to think: How does one use the crates to get the bananas despite the fact that they are filled with stones?
“One is beginning to see how the man's mind works.