“A physical book, and in particular such a beautiful one of over 800 pages, is a permanent invitation to flip through … . The more I did this, the more I got intimidated by the thought of writing a review on this mathematical marvel. … All them were a pleasure to read, and so I invite you all to share the mathematical joy I have felt … .” (Ilka Agricola, Jahresbericht der Deutschen Mathematiker-Vereinigung, Vol. 126 (2), 2023)“In my case, I spent several happy hours learning about affine differential geometry, something that would certainly never have happened if I had not picked up this volume. … The collected works of Eugenio Calabi are worthy of a place on the bookshelf of any person with a serious interest in differential geometry.” (Joel Fine, EMS Magazine, May 11, 2023)