A historical figure that I would bring back to life would be Louis Daguerre. Louis Daguerre was a French artist and photographer. He is particularly well-known for his invention of the daguerrotype process of photography, an early photographic type. Therefore, he is known as one of the fathers of photography.
I would imagine his favourite app would be Instagram. This is because the app would allow him to see the enormous progress that photography has made, and the important role that it has on our present lives.
