This is a great book about art in the twentieth century, and it left me with a better sense of how and why Calvino wrote and how to think about the art I consume going forward. It even has a quintessentially Calvino twist: the ironic title (there are, of course, only five memos — the book was published posthumously, and the sixth is left as an exercise to the reader.)
I suppose it is worth trying to qualify further why you should read this book, and I don’t think I have a compelling argument beyond “if you like modernism and if you like Calvino”, at which point you’re probably already predisposed enough to read this book that my recommendation is moot.
The one I can try is this: it is not dry, it is not academic, and if you treat this collection of essays as a tour through a very interesting writer’s favorite things about writing you will come away delighted with how you spent the past two hours of your time.