Idea
When a person thinks of something, that which they think about is called an "idea". Ideas are concepts which exist in the mind. Nobody really knows how this works. Ideas are a mental product.
One idea can change the whole world. If someone has a better idea, they can try to convince others.
Idea Media
Plato, one of the first philosophers to discuss ideas in detail. Aristotle claims that many of Plato's views were Pythagorean in origin.
"Modern Book Printing" from the Walk of Ideas
A picture of a lightbulb is often used to represent a person having a bright idea.
