Discard Everything That Does Not Spark Joy

Ms. Kondo’s decluttering theories are unique, and can be reduced to two basic tenets: Discard everything that does not “spark joy,” after thanking the objects that are getting the heave-ho for their service; and do not buy organizing equipment — your home already has all the storage you need.

Obsessive, gently self-mocking and tender toward the life cycle of, say, a pair of socks, Ms. Kondo delivers her tidy manifesto like a kind of Zen nanny, both hortatory and animistic.

“Don’t just open up your closet and decide after a cursory glance that everything in it gives you a thrill,” she writes. “You must take each outfit in your hand.”

Advice from decluttering expert Marie Kondo.