Conventional wisdom tells us that real joy comes from within: from exercise or meditation, acts of service or the way we look at the world—pretty much anything except material possessions.

But author/designer Ingrid Fetell Lee offers a different opinion in her book, "Joyful: The Surprising Power of Ordinary Things to Create Extraordinary Happiness." Lee tells Next Big Idea Club curator Adam Grant that there's tangible evidence of the powerful relationship between the way we feel and the objects that surround us, and she explains how we can harness that relationship to live healthier, happier lives.