A really slow book from Petroski. While I was hoping for a lot of in-depth looks at engineering failures, this book was way more full of metaphors for engineering processes -- many relying on cute stories about Petroski’s own family -- than looks at specifics. The stories he does relate, about the design and building of the Crystal Palace and the Kansas City Hyatt walk way collapse, are worthwhile but the rest of the book doesn’t hold together as interestingly as those chapters.