Each adirondack chair represents a potential reader I would recommend for the book I am reading and reviewing.
One Chair: It is likely I will be the only one reading this book.
Two Chairs: I may have one friend who might like this book.
Three Chairs: I like the book enough to suggest it to a friend or two.
Four Chairs: I like this book so much I know several friends to share it with.
Five Chairs: This book is so good it will be passed on and on and on…..