Through the same eye.

For generations, pathologists learned to see beside someone else. At the double-headed microscope, a trainee did more than share a field of view with a teacher. They watched attention move, uncertainty, linger, and judgment take shape before a diagnosis was spoken. As pathology moves from glass slides and microscopes to whole-slide imaging and screens that intimate form of apprenticeship is changing with it. Something will be lost: the physical closeness of two people looking through the same instrument and the quiet rituals through which generations of pathologists learned their craft. But the microscope was never what made that teaching possible. Digital pathology can place the same image before an entire room, bring distant colleagues to the same case, and allow a trainee to learn from a teacher across an ocean. The second head is not simply disappearing; in important ways, it is multiplying. The challenge for pathology education is therefore not to preserve the microscope, but to preserve what happened across it: attention, uncertainty, reasoning, and the transmission of judgment from one pathologist to another. The posture may change. The work of teaching someone how to see does not.