School children in Berlin individually designed and painted 1,000 dominoes – probably twice the size of the children themselves – and were arranged in curves and lines close to where the wall itself stood; a transient and see-through barrier to remind people that, just 20 years ago, East and West Germany were separate entities, with communism one side and capitalism the other – and, terrifyingly, death by shooting if one dared to try to cross the dividing wall