"A distiction is made between painters who work directly from nature and those who work purely from imagination.  Personally, I think neither of these methods must be preferred to the exclusion of the other.  Both may be used by the same individual, either because he needs contact with objects in order to receive sensations that will excite his creative faculty, or his sensations are already organized.  In either case he will be able to arrive at that totality which constitutes a picture."

-Henry Matisse