“The book is an in-depth, modern, clear exposition of the advanced theory of shapes and diffeomorphisms … . This makes the book accessible to a large audience, including graduate and postgraduate students. Moreover the book is extremely well written and very pleasant to read. … I strongly recommend this excellent book to every researcher or graduate student in the field of shapes and geometric analysis. Naturally, it will also be of interest to many Mathematicians … .” (Diaraf Seck, SIAM Review, Vol. 64 (1), March, 2022)