Yours truly can’t be the only “Mad Men” viewer to get envious every time an employee of Sterling Cooper enters his personal office, then closes the door, free to concentrate in silence or even take an emergency catnap.

A private office is so dignified, so peaceful—and much like a 1960s ad exec’s ashtray stand and desk-side minibar cart, it’s increasingly becoming a relic of the past.

This isn’t only the case for administrative employees or call center workers. Open plans are being introduced in offices of professions like law and medicine. Franklin Becker, director of International Workplace Studies Program at Cornell, mentions a colleague’s organization in California that wants to put new doctors in an open-plan environment.