Beginning of Essay
Visual sensation and visual perception are the processes by which we see and understand our surroundings. The difference between these processes and the dividing line where sensation ends and perception begins is debatable, however some distinctions can be made. ....

Middle of Essay
.... by interpretation. Interpretation gives the stimulus meaning, and involves psychological characteristics such as attitude or prior experience and means that in some cases, our interpretation may vary from other people's. For example, two people sense a round, flat, shiny object, one from a poor country, another from a rich country. The rich person might understand the object to be a music compact disc because he has had prior experience with them, but the poor person may not know what it was as he has never seen one before. The visual perceptual principles are processes which are applied to incoming visual stimuli to help explain any inconsisten ....