In July 2017, when Ingrid Fetell Lee and her husband, Albert Lee, bought their three-bedroom home in East Hampton, New York, Ingrid was writing Joyful: The Surprising Power of Ordinary Things to Create Extraordinary Happiness ($20; amazon.com). For 10 years, Ingrid had researched the things that universally bring people joy (that fleeting feeling, different from happiness, that we get seeing a balloon or flowers). Pulling from science and her industrial-design background, Ingrid found that adding more joy—at home, at work, in public spaces—can make us healthier and happier. It was a given that Ingrid and Albert would design their home with joy in mind, adding hits of unexpected color and highlighting their natural surroundings. “I wanted to create little moments that bring me joy as I move through the house,” she says.