For most of modern history, technology sought to imitate humans. Humans increasingly seek to imitate technology

Two faces that appeared on my Instagram feed in recent months gave me pause. One belonged to John Travolta at Cannes. The other to Carla Bruni on a date night with her husband, former French President Nicolas Sarkozy. Both looked recognisably themselves, yet, they both also looked oddly unfamiliar. Their looks have provoked speculation about cosmetic enhancement, though never acknowledged by them. Bruni has previously denied having had work done.

In any case the feeling lasted only a second: a flicker of unease, as though I were looking at people who had become approximations of themselves.

Joseph de Weck is an associate fellow with the German Council on Foreign Relations and writes for Guardian Europe from Zürich and Paris