i'm looking for useful material about graphic design. doesn't matter if it's a book, pdf or whatever. what i'm not looking for are all those books and tutorials which show you how to do a button or icon or something else. i'm more interested in the ideas and concepts behind a design (for webpages, logos or whatever) and stuff like the composition behind it....so more like a book about composition in art transferred to graphic design.
i hope you get what i mean and if someone knows some useful material it would be super nice to share it