Michael Dirda, who sounds like he has Collyer-brothers-size book storage problems of his own, tells us about this video in his “Freelance” column in The Times Literary Supplement of 10 April. Dirda, who has a basement plus a rented American Self-Storage space full of cartons of books, is wisely considering buying a country house well endowed with bookshelves, not decluttering.

As he says, the “collection” featured doesn’t really amount to much of a problem: if you can stack them all in front of the sofa in one room, then you’ve not seen a real collection yet. What Ms Kondo is teaching amidst all that mumbo jumbo about awakening the books, isn’t really worth knowing. The problem is never the weeding out and throwing away. The problem is the deciding that throwing away has to take place. Most book people would rather get rid of the sofa and the coffee table than their books: certainly they give off less of a “spark of joy” than even The Prentice-Hall Encyclopedia of Mathematics, which I hang onto in the belief that one day I’ll need to look up something in it. The passage of time has not dimmed this conviction one bit.

And of course there is the irony to be considered of buying a book called The Life-Changing Magic of Tidying Up so that you can throw away your books. The jacket claims two million copies sold — that’s quite a lot of clutter all on its own.

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