I'm Mary Lauran.

Riding a bicycle should be just a natural part of your life. It’s so easy. We are the only ones — ‘we,’ speaking as an American — we are generally the only ones who commute to work in racing clothing. Where is there room for debate about how ridiculous that is?

I think people are often quite unaware of their inner selves, their other selves, their imaginative selves, the selves that aren’t on show in the world. It’s something you grow out of from childhood onwards, losing possession of yourself, really. I think literature is one of the best ways back into that. You are hypnotized as soon as you get into a book that particularly works for you, whether it’s fiction or a poem. You find that your defenses drop, and as soon as that happens, an imaginative reality can take over because you are no longer censoring your own perceptions, your own awareness of the world.

In a landmark study, “Bowling Alone” (2000), the Harvard political scientist Robert D. Putnam noted a puzzling three-decade decline in what he called ‘social capital’: the networks of support and reciprocity that bind people together and help things get done collectively. His work considered the waning of everything from P.T.A. enrollment to dinner parties and card games, but the core of his argument was declining civic participation. Between 1973 and 1994, the number of people who held a leadership role in any local organization fell by more than half. Newspaper readership among people under thirty-five dropped during a similar period, as did voting rates. Why? Putnam pointed to cultural shifts among the post-Second World War generation; the privatization of leisure (for example, TV); and, to a smaller extent, the growth of a commuting culture and the time constraints of two-career, or single-parent, family life. “Older strands of social connection were being abraded—even destroyed—by technological and economic and social change,” he wrote.

Putnam, in other words, saw public institutions as a casualty of the same forces of individuation driving modern aloneness. And, unlike Klinenberg, who’s optimistic about solo life largely because he’s optimistic about the socializing effects of technology, Putnam believed that digital communication offers too weak a connection to reverse the loss of community skills.

Solitude is out of fashion. Our companies, our schools and our culture are in thrall to an idea I call the New Groupthink, which holds that creativity and achievement come from an oddly gregarious place. Most of us now work in teams, in offices without walls, for managers who prize people skills above all. Lone geniuses are out. Collaboration is in.

But there’s a problem with this view. Research strongly suggests that people are more creative when they enjoy privacy and freedom from interruption. … A person sitting quietly under a tree in the backyard, while everyone else is clinking glasses on the patio, is more likely to have an apple land on his head.

We’ve become accustomed to a new way of being “alone together.” Technology-enabled, we are able to be with one another, and also elsewhere, connected to wherever we want to be. We want to customize our lives. We want to move in and out of where we are because the thing we value most is control over where we focus our attention. We have gotten used to the idea of being in a tribe of one, loyal to our own party. … We can end up hiding from one another, even as we are constantly connected to one another.