When we perceive an object, we automatically tend to label it (like nice, bad, wet, dry, light, dark, etc.). As soon as our mind puts a label on an object, the label takes the place of the actual object in our mental processes. As our mental image or label can never represent all the different qualities and characteristics of any object, it is always just a simplified, usually exaggerated, subjective snap shot. However, our mind reacts on the basis of our own mental label of an object. No wonder we tend to react simplistic, exaggerated and subjective in many situations. All perceived objects are conditioned by our senses and our own mind. This leads to the dramatic conclusion that we are not and by definition can never be objective!
Or, as the famous physicist Werner Heisenberg said,
"What we observe is not nature itself, but nature exposed to our method of questioning"....