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Plato from The School of Athens by Raphael, 1509
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Platonic idealism usually refers to Plato's theory of forms or doctrine of ideas. Some commentators hold Plato argued that truth is an abstraction. In other words, we are urged to believe that Plato's theory of ideas is an abstraction, divorced from the so-called external world, of modern European philosophy, despite the fact Plato taught that ideas are ultimately real, and different from non-ideal things--indeed, he argued for a distinction between the ideal and non-ideal realm.
These commentators speak thus: For example, a particular tree, with a branch or two missing, possibly alive, possibly dead, and with the initials of two lovers carved into its bark, is distinct from the abstract form of Tree-ness. A Tree is the ideal that each of us holds that allows us to identify the imperfect reflections of trees all around us.
Some contemporary linguistic philosophers construe "Platonism" to mean the proposition that universals exist independently of particulars (a universal is anything that can be predicated of a particular).
Platonism is an ancient school of philosophy, founded by Plato; at the beginning, this school had a physical existence at a site just outside the walls of Athens called the Academy, as well as the intellectual unity of a shared approach to philosophizing.
Platonism is usually divided into three periods:
Plato's students used the hypomnemata as the foundation to his philosophic approach to knowledge. The hypomnemata constituted a material memory of things read, heard, or thought, thus offering these as an accumulated treasure for rereading and later meditation. For the Neoplatonist they also formed a raw material for the writing of more systematic treatises in which were given arguments and means by which to struggle against some defect (such as anger, envy, gossip, flattery) or to overcome some difficult circumstance (such as a mourning, an exile, downfall, disgrace).
One statement of this philosophy is the thesis that mathematics is not created but discovered. A lucid statement of this is found in an essay written by the British mathematician G. H. Hardy in defense of pure mathematics.
The absence in this thesis of clear distinction between mathematical and nonmathematical "creation" leaves open the inference that it applies to allegedly creative endeavors in art, music, and literature.
It is unknown if Plato's ideas of idealism have some earlier origin, but Plato held Pythagoras in high regard, and Pythagoras as well as his followers in the movement known as Pythagoreanism claimed the world was literally built up from numbers, an abstract, absolute form.
See also 
- Cambridge Platonists
- Platonic epistemology
- Platonic realism
- Philosophy of mathematics
- In the field of philosophy, it has been customary to capitalize words that are concept names, such as "Search for Truth" (or "Goodness" or "Man"). Common ideals are Truth, Kindness, and Beauty. Such capitalization is not common in science, and hence, concepts such as "accuracy" and "gravity" are not often capitalized in scientific writing, but could be capitalized in philosophical papers.
- "Plato And The Theory Of Forms", Tim Ruggiero, Philosophical Society, July 2002, webpage: PhilosophicalSociety-Forms.
- Plato's Theory of Ideas, by W.D. Ross.
- Platonism and the Spiritual Life, by George Santayana.
- IDEA AND FORM. ΙΔΕΑ ΚΑΙ ΕΙΔΟΣ. On the Foundations of the Philosophy of Plato and the Presocratics (IDEA I FORMA. ΙΔΕΑ ΚΑΙ ΕΙΔΟΣ. O fundamentach filozofii Platona i presokratyków), by Artur Rodziewicz, 2012.