Thirty years after the Berlin Wall fell, some of us still have chunks of rock in perspex boxes. We keep them with other items we no longer value but feel bad about throwing away. Back in 1990, every gift shop had a supply of ‘stones from the Berlin Wall’. These were presented to children because the destruction of the Wall was seen as having massive historical significance. In 2021, how many people remember the political events leading to the Wall’s demolition, or the reasons why it was built in the first place?