Vignette: Five Monkeys
Imagine the following scenarioi:
Start with a cage containing five monkeys. Inside the cage hang a banana on a high string so that it is inaccessible to the monkeys without a ladder. Place a folding ladder under the banana high enough to reach the banana. Before long, one of the monkeys will go to the ladder and start to climb toward the banana. As soon as it touches the ladder, spray all the other monkeys with cold water.
After a while, another monkey makes a similar attempt. As soon as he also touches the ladder, spray all the other monkeys with cold water again.
Soon, all the monkeys in that cage will try to prevent any monkey from climbing the ladder for obvious reasons. ...