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9/24/2019

The Blind Scientists and the Elephant

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I have tried to explain in my blog how scientific theories arise, and how the initial theories generated in an emerging scientific field are very different from the fully developed theories of a mature scientific field. In this post I will attempt to do this again using the ancient parable of the blind men and the elephant. This is a story found in Hindu and Buddhist texts dating back more than 3,000 years. It has been used in religious and philosophical contexts to illustrate how we often think we know the truth, even though we have just grasped only part of it. The most famous version in English is the poem entitled “The Blind Men and the Elephant” written by the poet John Godfrey Saxe.
 
So let’s imagine a physical reality which in our case has the shape of an elephant, and that we will call “the elephant”. Let’s also imagine an emerging scientific field that is trying to research said elephant. The field is represented by six scientists who seek to figure out how the elephant looks. But the scientists are in the dark as shown by the blindfolds they are wearing. So each of these scientists approaches the elephant and begins to research it. In our story this is exemplified by the scientists touching the elephant.
 
Scientist 1 grabs the elephant by the tail and puts forward the hypothesis that the elephant is like a rope.

Scientist 2 touches the elephant’s leg and puts forward the hypothesis that the elephant is like a tree.

Scientist 3 touches the side of the elephant and puts forward the hypothesis that the elephant is like a wall.

Scientist 4 touches the ears of the elephant and puts forward the hypothesis that the elephant is like a fan.

Scientist 5 grabs the tusk of the elephant and puts forward the hypothesis that the elephant is like a spear.

Scientist 6 feels the moving trunk of the elephant and puts forward the hypothesis that the elephant is like a snake.
Picture
Researching the Elephant

​In the various versions of the parable, the blind men quarrel with each other, as each is one is convinced that their version of what the elephant looks like is the truth. The parable ends mocking their hubris at thinking that each one knows the truth when really none of them knows the whole truth (the real shape of the elephant). However, there is one fundamental difference between these versions of the parable and mine. In my version, the blind men are scientists, and that makes all the difference!
 
These scientists are not working in isolation. They discuss and cooperate with each other. Mind you, some of these scientists may argue very forcefully in favor of their particular idea of how the elephant looks, and others may argue back just as forcefully that they are wrong. However, these scientists go to meetings, give presentations, face each other, exchange information, and publish their research results regarding the shape of the elephant in peer-reviewed journals. Each scientist tries to reproduce the observations made by others.
 
The scientist who touched the tail and concluded that the elephant was like a rope, also touches the leg of the elephant, and realizes that he should modify his original hypothesis to incorporate this new information. Thus he proposes that the elephant looks like a tree with a rope sticking out of it. The scientist who touched the side of the elephant and concluded that the elephant was like a wall, also touches the ear, and realizes he should modify his original hypothesis to include this information. He now proposes that the elephant looks like a wall with a fan sticking out of it. The same happens with the other scientists.

​As new information becomes available, scientists modify their original views and try to harmonize all the knowledge about the elephant. Mind you, this can be a messy process that may be hampered by methodological difficulties. For example, some scientists may not reach high enough to touch the ear, or may not be nimble enough to catch the tail and they remain unconvinced of claims that the elephant is like a fan or a rope. Nevertheless, after a period of time, a majority of these scientists come to an agreement and put out the first theory regarding how the elephant looks!
​
PictureThe First Theory
As you can see from the image, this theory about how the elephant looks is a very preliminary one. However, there is something “elephant-like” about it. Clearly the theory has grasped some aspects of the reality the scientists were studying. In its present form the theory may even have some usefulness, but the theory is clearly incomplete. It does not reflect the full reality of how the elephant looks. Nevertheless, this theory represents a group effort. The scientists are trying to fit all the relevant information that is available to come up with the answers.
​

So the research continues. A scientist may find that the elephant has not one leg but four. The scientist reasons, “Hmm, the elephant is like four trees? That doesn’t make sense.” Another may find that the surface of the wall is much larger and is connected to the four legs at the bottom and completely surrounds the elephant at the middle. He may think, “What type of wall is this? The elephant may not be like a wall after all.” As more observations keep piling in, the original theory is found to be unsatisfactory and is replaced by one that incorporates the new observations. This new theory is more complete and its image would look more like an elephant.

Scientists develop new methods to investigate the shape of the elephant generating more information. Scientists from other disciplines may also take up the research of how the elephant looks bringing in their expertise and new ideas. As this process keeps going and the scientific field that studies the elephant reaches maturity, a theory is put forward that explains the majority of the observations regarding how the elephant looks. The theory is used to make predictions that turn out to be true and generates practical applications. The scientists stop arguing with each other regarding the most relevant aspects of what the elephant looks like, and they reach a consensus.
Picture
The Fully Developed Theory

​Thus something has happened that has never happened in any of the previous versions of the parable. The scientists studying the elephant don’t have their blindfolds on anymore. They are able to behold the true shape of the elephant. By working together, exchanging information, trying to reproduce what others did, and trying to come up with explanations for all the observations, they have discovered the truth!
 
That is how science works.
 
The images by Paula Bensadoun can only be used by permission from the author.

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