That might mean either developing a uniform way to mark videos and images, showing when and who they were made by, or abandoning phone calls altogether and moving towards data-based communications—using apps like FaceTime or WhatsApp, which can be tied to your identity.

A tattoo is a permanent mark or design made on your skin with pigments inserted through pricks into the skin's top layer.

Stand in the street, holding a huge yellow paper made question mark over your head.