An Egyptian family sit proudly for the artist – I nearly wrote, for the camera. But the lifelike portrayal of the Dwarf Seneb and his Family, one of the most captivating things in the Egyptian Museum in Cairo, right at the heart of the revolution on Tahrir Square, was carved and painted at least 4,000 years before the invention of photography. It is one of the earliest works of art in history to which it seems fitting to give the title “portrait.”