Plato’s proposal of the World of Ideas and World of Senses is known as Plato’s Dichotomy of Existence or two realm concept. That the whole of reality exists at two levels.
The World of Ideas is immutable, immortal and non-temporal — A place where substance or universal aspect or essence of everything in the World of Senses comes from.
The World of Senses is transient, mortal and temporal — A place where copies of substance or universal aspects or essence of what is real, exists — a place of imitation of reality. This is the place where we ordinary humans live....
Plato’s rationale for his belief in the two worlds
If we wish to know the meaning of concepts such as beauty, sweet and justice, we can only point towards the objects that illustrate these concepts. Meaning, such concepts are only exemplified and not actually found in the World of the Senses. Therefore, these concepts must come from somewhere else — The World of Ideas. As a matter of fact, there is nothing in the World of Senses that corresponds to a perfect circle, but still the concept of a perfect circle exists in our minds.
Those who had a lifelong exposure to hindy philosophy, like Steve and myself, grasp instantaneously the meaning of Plato's cosmic model.
What I emphasized, is strictly related to the 'vast spheres of thought' cited by Anandamoy. Plato's world of ideas is the causal world, where the spheres of thought dwell, whence everything we can think of has an origin.
