Plato's Theory of Forms: Intelligible and Visible Worlds

Plato: The Athenian Philosopher

Plato (5th century BC) was an Athenian philosopher who founded the Academy, where he taught his doctrine. He never wrote down his core teachings; what remains are copies, works, and dialogues intended for those outside his school. In these dialogues, the central character is Socrates, who was Plato's teacher.

Plato's Dualistic Reality

Plato proposed that we must differentiate between two distinct realities or worlds:

1. The Intelligible World

This is the authentic, real world apprehended by the mind, often called the World of Ideas. It is characterized by:

• Universal entities that serve as the models for the physical world.
• The realm of essences.
• A state of permanence where nothing changes.

Plato argued that for a concept like a "table" or a "human" to exist, there must be an original, perfect idea of that entity in the intelligible realm. While our world is in constant flux, the intelligible world remains constant.

2. The Visible World

This is the world of objects perceived through the senses—the world of experience. It consists of:

• Entities that appear and disappear.
• Constant change and instability.
• Copies or reproductions of the original ideas.

Plato considered this the "false" world, as it is merely a shadow of the intelligible realm.

Knowledge: Episteme vs. Doxa

The intelligible world represents episteme (true knowledge), which is obtained solely through reason. Conversely, knowledge of the visible world is considered false or unreliable because it is based on experience, perception, and the senses, which are subject to constant change.

The Human Soul and Reincarnation

Plato posited that a human is composed of a soul and a body. He believed the soul is akin to the ideas, while the body belongs to the visible world. He argued that the soul once resided in the intelligible world and knew the forms, but upon uniting with the body, it forgot everything.

Therefore, Plato famously stated that learning is simply the act of remembering what the soul already knew. He further believed that when the body dies, the soul is reincarnated.