In the City of the Ghosts (Portrait of an idea)

There is little raw material to write about an idea, What can we say about an idea ? What is it made of ? Mental operations. How does it operate ? ??? I have to be sincere, I do not know what to say. An idea is a mental construct that is been made of a mix of all provided historical and cultural information , a bagage, as well as geographical variable of the human that thinks. We can say that this last sentence is more or less an acceptable definition of an idea.