Book excerpt: This book looks to fill the 'blue hole' in Global History by studying the role of the oceans themselves in the creation, development, reproduction and adaptation of knowledge across the Atlantic world. It shows how globalisation and the growth of maritime knowledge served to reinforce one another, and demonstrates how and why maritime history should be put firmly at the heart of global history. Exploring the dynamics of globalisation, knowledge-making and European expansion, Global Ocean of Knowledge takes a transnational approach and transgresses the traditional border between the early modern and modern periods. It focuses on three main periodisations, which correspond with major transformations in the globalisation of the Atlantic World, and analyses how and to what extent globalisation forces from above and from below influenced the development and exchange of knowledge. Davids distinguishes three forms of globalising forces 'from above'; imperial, commercial and religious, alongside self-organisation, the globalising force 'from below'. Exploring how globalisation advanced and its relationship with knowledge changed over time, this book bridges global, maritime, intellectual and economic history to reflect on the role of the oceans in making the world a more connected place.