I would like some tips about what book I should read if I want to properly understand the relation between local symmetry and forces in gauge theories. And with properly uinderstand I mean a combination of mathematics and intuition/visualization. On the topic of QFT I have the books by Zee ( ...nutshell) and Peskin&Schroeder (introduction to...) but still I would like something else. For instance I just noticed a book by Vincent Icke, Force of Symmetry, that might be something but I haven't bought it yet. So, who has some experience with good literature on this subject?