There is nothing like "IMAGINATION"

There is nothing like "imagination". Any piece of imagination which comes out of someone's mind is a collection of entities and concepts known to the individual before, which are something he has been exposed to before in some form or the other.

Note that it is a collection. I won't even say it is a 'combination', of entities and concepts, since the way the concepts/entities/concepts have been combined are concepts themselves again, known to the mind before.

Suppose I imagine a pigeon. Then a computer comes out of its body and the 2 enter a drum. The pigeon, 'one thing coming out of a body', computer, drum and '2 things entering a third body' are all entities and concepts known to the mind before. (The items in quotes are concepts, the rest are entities).

So an imagination is a (TIME/SPACE)-SERIES of entities and/or concepts known to the mind beforehand. The particular items in the series and their temporal/spatial order is what identifies a particular piece of imagination.