But from the first day of my first real job, as an administrative assistant at the Park Avenue headquarters of a commercial bank that is now defunct, I realized that emotions were simmering everywhere in the workplace.

My desk, on the hushed, deep-pile-carpeted executive floor, was a few feet opposite the restroom doors. (Clearly, I was lowest in the pecking order.) Every few days, one of the three executive women on my half of the floor would rush into the restroom and, after a little too long, re-emerge with the remnants of a good cry still visible on her splotchy face. I also watched men dash into the men’s room and leave a few minutes later, tight-lipped and ashen.

Even as a 21-year-old workplace neophyte, I realized that emotion is a force that underlies all of our behavior. For my book, “It’s Always Personal: Emotion in the New Workplace,” I spent two years exploring Americans’ attitudes toward emotion at work today, and my findings suggest this amended version of Descartes’s famous line: I think and feel, therefore I am.

In the old days — pre-Internet, pre-cellphones — it was a lot easier to believe “work equals rational” and “home equals emotional.” But now that work and home life constantly bleed into each other, that distinction has become anachronistic and probably self-defeating. People text and e-mail their friends and family members throughout the workday, and they receive messages from colleagues and clients on nights and weekends and during vacations.

The membranes between private life and work, especially office work, have always been porous, but today employers and employees expect accessibility and accountability pretty much round-the-clock. And whereas old-school office memos and business letters generally weren’t expected to be friendly or candid — that is, human — business e-mails most definitely are.

Conversely, what used to be considered private behavior can instantly reverberate at work through social networking. People fire off e-mails late at night, only to regret their tone and intent in the cold light of day. Facebook friends from work can stumble upon wild and crazy pictures from a bachelorette party. Tweets and anonymous mobile video uploads can instantly broadcast unflattering emotional displays by surly customer service employees or misbehaving C.E.O.’s.

The conventional wisdom used to be that we brought home the emotions we couldn’t express at work — snapping (or worse) at blameless partners and children. That is still true, but what’s new is that home life, with all its messy, complicated emotional currents, has become inextricably and undeniably woven into the workplace.

The rulebook for modern office etiquette has yet to be codified. How do we avoid hurting one another’s feelings if everything is supposed to be rational, yet also transparent and accessible? How can others understand the emotion behind what we’re trying to say in an e-mail if no one takes the time to read beyond the subject line and the first sentence?

And the more we relegate communication to the electronic realm, the greater our longing for face-to-face contact. Our new “flat” organizational structures at work might seem to promote a more hang-loose level of emotional expression. But, if anything, flatter organizations tend to require even higher levels of emotional competency and effort in order to navigate amorphous command structures.

NO one is sure where the lines are anymore. Should we high-five an underling? Is it cool to make jokes with the boss? What if we overhear the man in the next cubicle crying?

Clear rules for this new working world simply don’t exist. But one thing is certain. The Millennials, a generation raised with the 24/7 naked emotional transparency of texting and social networking, is now entering the work force by the millions each year. As they replace old-schoolers born in the 1940s and ’50s, there is no turning back to a compartmentalized world.

I like to imagine that if men and women were to express more emotion routinely and easily at work — jokes, warmth, sadness, anger, tears, joy, all of it — then as a people we might not feel so chronically anxious and overwhelmed. By denying the range of emotional expressiveness intrinsic and appropriate to the workplace, we find ourselves at a loss for how to handle this brave new boundary-less world.

Overtly acknowledging how and in what measure anger, anxiety, fear and pleasure color and shape our working lives can help us manage those emotions and use them to our benefit, both at work and at home.

E-mail: preoccupations@nytimes.com.

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