Currency is at the heart of all modern civilisations. Individuals exchange pieces of paper and small metal disks with the understanding that they are worth something more than they appear to be. It is an unspoken bond that connects millions of people. So it is fascinating when you realise that these objects are intrinsically valueless, they are only deemed valuable because other people impose value onto them e.g. the material value of a £1 coin is only 4.7p.