Public knowledge is referred to as “knowledge by description.” Its function is to observe the subject. Knowledge is considered to be public when the proposition is true, when you believe that it is true, and when the is supporting evidence without any opposing evidence. Cubist Cat can be viewed publicly by all. When one looks at the painting it can be concluded that it is made entirely out of geometric shapes. The viewer may also conclude that the colors in the painting cover the entire visible spectrum and that the shapes are better defined by the black lined separating each one. As with everything there are both advantages and disadvantages to disadvantaged to public knowledge. Some advantages of public knowledge are that it can be proven true because it is based on what is real. Nothing is inferred about the topic, the only thing proven is what can be seen by all, like the painting being made entirely out of geometric shapes.
Private knowledge is referred to as “knowledge by acquaintance.” Its function is to duplicate and reproduce an experience or feeling. Some examples of private knowledge are belief, opinion and feeling. No proof is needed for private knowledge because it is different for each individual. When viewing Cubist Cat using private knowledge, one viewer may just see the image of a cat, whereas others may see something else. As with public knowledge, private knowledge also has its advantages and disadvantages. An advantage to private knowledge is that the topic does not just exist, but also has a meaning for each individual person. One viewer of Cubist Cat may conclude that the colors help to create a feeling of peacefulness, whereas another concludes that they create a feeling of serenity. Because private knowledge is different for everyone it is very difficult to define and express so that others will fully understand what the viewer is feeling. Private knowledge is not always reliable because the knowledge is different for everyone, and it cannot be proved to be true.
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