Everything is being studied, analyzed, examined. So does anybody know if there is a magical number when it comes to chapters or pages? What would sell better? 7 chapters, 150 pages. 32 chapters, 322 pages?

In Americanae Avventurose, Italian writer, Cristina Campo draws the portrait of 20 "Adventurous American", women whose behaviors or ideas make them stand apart. Those portraits includes that of Mae West, Hilda Doolittle, Josephine Nivison, and Kay Swift.

In Le Premier Homme de Ma Vie, French journalist Olivia Benhamou, interviews 11 (eleven) daughers about their relationship with their fathers. Among the interviews: writer, Camille Laurens; artist, Mâkhi Xenakis; and former porn star, Brigitte Lahaie.

In turn, former "Culture Reporter" for Le Monde, Yvonne Baby, picks to describe 15 "Magnificent Men" in her first book, Quinze Hommes Spendides i.e. Orson Welles, Ingmar Bergman, Robert Bresson, Terrence Malick, Robert Motherwell, Luis Buñuel, Pierre Boulez, Federico Fellini, Hans Magnus Enzensberger, Peter Handke, Woody Allen, Jean-Luc Godard, François Truffaut, Yves Saint Laurent et Yohji Yamamoto.

So my question today is: What is the magic number -- and why?