I own far more books than I could possibly read over the course of my remaining life, yet every month I add a few dozen more to my shelves. For years I felt guilty about this situation, until I read an article by Jessica Stillman on the website of the magazine Inc. titled “Why You Should Surround Yourself With More Books Than You’ll Ever Have Time to Read.” Stillman argued that a personal library too big to get through in a lifetime “isn’t a sign of failure or ignorance,” but rather “a badge of honor.” Her argument was a variation on a theme put forth by Nassim Nicholas Taleb in his 2007 best seller “The Black Swan,” a book about the outsize impact on our lives of large, unpredictable events. In essence, Taleb claims that although people tend to place a higher value on the things they know than on the things they don’t know, it is the things we don’t know, and therefore can’t see coming, that tend to shape our world most dramatically.

A person’s library is often a symbolic representation of his or her mind. A man who has quit expanding his personal library may have reached the point where he thinks he knows all he needs to and that what he doesn’t know can’t hurt him. He has no desire to keep growing intellectually. The man with an ever-expanding library understands the importance of remaining curious, open to new ideas and voices.

Taleb argues that a personal library “should contain as much of what you do not know as your financial means, mortgage rates and the currently tight real-estate market allow you to put there. You will accumulate more knowledge and more books as you grow older, and the growing number of unread books on the shelves will look at you menacingly. Indeed, the more you know, the larger the rows of unread books. Let us call this collection of unread books an antilibrary.”

I don’t really like Taleb’s term “antilibrary.” A library is a collection of books, many of which remain unread for long periods of time. I don’t see how that differs from an antilibrary. A better term for what he’s talking about might be tsundoku, a Japanese word for a stack of books that you have purchased but not yet read. My personal library is about one-tenth books I have read and nine-tenths tsundoku. I probably own about 3,000 books. But many of those books are anthologies or compilations that contain multiple books within them. I own a lot of Library of America volumes, a series that publishes the complete novels of authors like Dashiell Hammett and Nathanael West as a single book. Thus, my 3,000-book library probably holds more than 6,000 works. Once I have read a book, I often give it away or trade it in at a used-book store. As a result, my tsundoku is ever expanding while the number of books in my house that I have read remains fairly constant at a few hundred.