Since people are all different altogether we have different view points. Therefore each and every individual's perspective is different. Each and every individual assume, presume differently as and perspective also varies. Lets take a stand fan for an example.

When you look at the fan as yourself; your view point of the fan at which you are standing at may be at the front of the fan, where you can see the branding and the front head of the fan but from another person's point of view he actually sees the back of the fan, etc.

Therefore even though two may be discussing about the same topic or looking at the same topic
they will see things differently as they are at a different view point.

Therefore we should actually stop just being content to be in our original standing point and step out of our comfort zone of the original and enter into the person's standing point and see things differently of the same situation. Thus one gains knowledge through this experience.