Originally Posted by XD2

Just to clarify you can copyright an idea as long as you can explain the workings of the idea.

So no you couldn't just think of a car flying and then copyright the flying car idea. But if you can explain how the car would fly and the technology required then yes you can copyright the flying car idea.

Point being you don't need any physical representation of what you want to patent aslong as all the theoretical workings are detailed.