This timely book invites the reader to explore the lexicon of 'subjects' and 'objects' of EU law as a platform from which several dilemmas and omissions of EU law can be researched. It includes a number of case studies from a wide range of areas of EU law (constitutional and administrative law, external relations and trade, citizenship) that deploy this lexicon, structuring the contributions around three principal elements: the transformations, the crises and the external-internal dynamics of EU law.