Two worlds
According to Plato reality is divided into two or the world into two namely:
A sensory world
The first reality of this is that which includes physical objects presented to the five senses, or it can be said that the first relativity that Plato meant is something that can be reached by the senses such as flowers, trees and others. At this stage it must be admitted that everything remains in change. The flower that is now good the next day has withered, again the sensory world is marked by plurality. So the flowers were, there are still a lot of good things too.
The world of ideas
Besides there is a constantly changing sensory world, according to Plato there is also a world that never changes that is called the ideal world or the world that consists of ideas. In an ideal world nothing ever changes. All ideas are eternal and unchangeable. In an ideal world there are not many good things because there is only one "good" idea. Similarly with other ideas that are eternal and perfect.
However, when Plato says that the world exists is the sensory world and the ideal world, then what is the relationship between the two with this world? Ideas are not influenced by material things at all. The circle depicted on the chalkboard then deleted again, does not affect the "circle" idea at all. But Ideas underlie and cause bodily objects.
The relationship between ideas and physical reality is like the one above, so that physical things can not be unfettered by the Ideas. Plato reveals that relationship in three ways: [2]
First he says that the Idea is present in concrete objects. But with the idea itself is not reduced in the least.
In other ways, he says that concrete objects take the idea. Thus Plato introduces "participation" (metexis) into philosophy. Each physical body participates in one or more ideas. If we take for example: one nice flower, then the flower takes part in the idea of "flowers", "nice" and "one". However, participation does not diminish the idea.
Plato also said that the idea is a model or example (paradigm) for concrete objects. These concrete objects are imperfect images that resemble the model.
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