How does the method of images work? I can see why it works (by going back to the form of the Green function and differentiating) but don't see how useful it is to solve problems. At the moment I am basically memorising the different images for each boundary condition which I am sure is not the way to go. How do you think about it so that one can work out the solution logically from the method of images? Is there a way to work out the solution from the method of images alone without needing to do any differentiation?