The chapter explores the production, persistence, and adaptation of spatial planning ideas, and their mobility across places with a focus on global south contexts. It considers the origination and travel of ideas across global regions, showing the intersections and tensions of these circulations, and the transcalar processes that are involved. Our discussion centres on two interrelated themes. First, the nature and form of planning and the debates and tensions between a shift towards strategic spatial planning and the resurgence of master planning in Africa, in the context of multiple global influences and national-local agendas and interests. Second, the current debates over the nature and form of spatial development, in particular, the promotion of new towns/cities versus urban compaction, including models of corridors and transit-oriented development, and the way these converge and diverge in terms of sustainability debates. The chapter traces the evolution of these ideas, the way they have been transferred, adapted, and hybridised with local ideas as they cross contexts. We consider these processes across Africa but use South Africa as the illustrative example for the second theme.