In Germany and around the world, the last residence of persecuted Jews and other victims of Nazi terror are marked by small brass bricks called Stolpersteine – Stumbling Stones. There are more than 70,000 of these 10 by 10 cm stones installed in cobblestoned and paved sidewalks all made by hand by the artist Gunter Demnig who began the project back in 1992. It has now become common for many in Germany to mark the 9th of November – the anniversary of Kristallnacht – and the 27th of January – Holocaust Remembrance Day on the anniversary of the Red Army’s liberation of Auschwitz – by polishing local Stolpersteine.

Stolpersteine are easy to clean using only expired ketchup and a toothbrush
While the Stolpersteine are ubiquitous across Germany, there are a few exceptions. The city of Munich banned the installation of new Stolpersteine in 2015 after claims that they were disrespectful of the dead, whose names were walked on by the living. In Erfurt, where I now work, the Stolpersteine are not banned, but instead the last known residence of Nazi victims is marked by a DenkNadel – a memorial needle. The civic group Erfurter GeDenken called for proposals in 2007 to create a uniquely Erfurt commemoration for the victims of Nazi terror and local artist Sophie Hollmann won the competition with her design: a silver cone topped by an orange ball as if it was a giant pushpin pressed into the street to mark the spot. The first set of DenkNadel were installed on November 9, 2009 with five more installed in the following years across the city.