In spite of users’ grumbling about noise, distractions, and lack of privacy, the open-plan workplace—in its post-cubicle incarnation, with flexible, casual seating, and ample places to commune and play—continues to gain dominance in office design. Recent studies on productivity, however, advise companies to gear such schemes only to specific business cultures, preferably those of tech or media services firms, and where millennials are in the majority. (Apparently that cohort has a special ability to concentrate anywhere, anytime, and churn out work while playing Ping-Pong.)

Horizon Media fits this profile well: 70 percent of the high-octane media planning and buying agency’s staff is under 30. Founded in 1989 in New York, the firm, whose clients include Geico and Burger King, now has over 1,200 employees.