Born in the 5th century BCE, Plato was a rationalist and idealist philosopher, believing that we are born with concepts within us and that these concepts are the same for everything the world (Salomon, Higgins and Martin, 2012). Through his beliefs, Plato developed a theory that he believed answered the question “What is reality?” », which he called the theory of Forms (Solomon, et al., 2012). According to Plato, the Forms are a perfect ideal of an object or concept, immutable and innate in us (Solomon, et al., 2012). It is through the Forms, according to Plato, that we have the ability to know what something is even though we may not have seen that exact thing before (Solomon, et al., 2012). According to Plato, an appearance is what a thing is. you see. Appearance is what we see, it is subject to change whereas reality is the unchanging, underlying idea behind what we see. The reality of an object lies in its essence, its innate qualities that make the object that object. This is what Plato calls his Form. For example a pen. Its appearance is that of a pen. It is a long cylindrical shape, when you press the paper, the ink comes out. Its reality comes from the fact that we, as humans, hold the idea of ​​a pen. The fundamental principle of what a pen is and what it does. According to Plato, everyone must have the same reality, because reality is in the essence of an object or concept (Solomon, et al., 2012). If the object or concept had no essence, it would not be what we think it is. Therefore, reality is universal and immutable, because if it changed it would not contain the same essence, regardless of how matter or appearance has the ability to change (Solomon, et al., 2010) . The distinction that Plato makes between a...... middle of paper...... investigates whether reality is in fact universal or not. Another limitation of Plato's theory is when Plato says that things in the "world of becoming" "participate" in the forms of the "world of being" (Solomon, et al., 2012). One might suggest that the word “participate” is just a word, and not an explanation of the relationship between the Form and the particular thing (Solomon, et al., 2012). Regarding this limitation, Plato himself expressed doubts, which he expressed in his later dialogues (Solomon, et al., 2012). It can be argued that Plato's theory of Forms does not fully take into account all areas of knowledge or appearance and reality. without creating limits. His theory suggests predicting a universal reality, but suggestions for how this might not be possible can be found, provided that it does not fully account for the universal reality..