[1] The book uses visual language to present a general theory about couplings, and how individuals are never alone because they always align themselves with the Other.

At 1013 pages,[1] it is the longest book in the series and analyzes the philosophical foundations of the last 2000 years of human history, beginning with how the ancient Greeks represented the world as an orb and thereby began globalisation.

[1] Focusing on contemporary times, it analyzes how social bubbles are bound together to constitute a society, and moves into a theology where spatiality is at the centre.

[4] The Canadian philosopher Marie-Eve Morin highlights the large scope of Sloterdijk's attempt to analyze globalisation through the spatial implications in Martin Heidegger's Dasein concept, writing that the Spheres trilogy offers "a comprehensive narrative concerning the historical development of humankind".

[5] Comparing the Spheres trilogy to the pessimistic theories about human societies in Carl Schmitt's Land and Sea [it] (1942), the media studies scholar Ethan Stoneman writes that Sloterdijk's "spherology" offers an affirmative "spatial anthropology" where shared spaces and shared living are ever-renewable, without the need for nostalgia, resignation or expansionist geopolitics.