Once upon a time, several blind sages groped an elephant in order to understand what it looks like. But everyone studied only the part of the animal that was closest to him. One said the elephant was like a snake, holding it by its trunk. Another held its leg and insisted that it looked like a tree. The third held a tail and said the elephant looked like liana. In the end, the wise men could not agree and understand how the elephant looks like.
An interesting fact is that each of them was right in his own way; each simply saw the situation only from his own side and refused to accept information from his peers. If they had put together their observations, then, most likely, they could compile complete information and see the whole picture.