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This thesis is about conceptual aspects of gauge theories.  Gauge theories lie at the heart of modern physics: in particular, theyconstitute the standard model of particle physics. At its simplest, the idea ofgauge is that nature is best described using a descriptively redundantlanguage; the different descriptions are said to be related by a gaugesymmetry. The over-arching question the thesis aims to answer is: how candescriptive redundancy be fruitful for physics?

Why gauge? Conceptual Aspects of Gauge theories