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A Stolperstein literally "stumbling stone", metaphorically a "stumbling block" is a sett-size, 10 by 10 centimetres (3.9 in × 3.9 in) concrete cube bearing a brass plate inscribed with the name and life dates of victims of Nazi extermination or persecution.

The Stolpersteine project, initiated by the German artist Gunter Demnig in 1992, aims to commemorate individuals at exactly the last place of residency—or, sometimes, work—which was freely chosen by the person before he or she fell victim to Nazi terror, euthanasia, eugenics, was deported to a concentration or extermination camp, or escaped persecution by emigration or suicide. As of 29 March 2018, over 67,000 Stolpersteine have been laid in 22 countries, making the Stolpersteine project the world's largest decentralized memorial.

The majority of Stolpersteine commemorate Jewish victims of the Holocaust. Others have been placed for Sinti and Romani people (then also called "gypsies"), homosexuals, the physically or mentally disabled, Jehovah's Witnesses, black people, members of the Communist Party, the Social Democratic Party, and the anti-Nazi Resistance, the Christian opposition (both Protestants and Catholics), and Freemasons, along with International Brigade soldiers in the Spanish Civil War, military deserters, conscientious objectors, escape helpers, capitulators, "habitual criminals", looters, and others charged with treason, military disobedience, or undermining the Nazi military, as well as Allied soldiers.

Jakob Lemel and Dyszka Zolty were Polish Jews who made a living as a market vendor. They settled in Lier in 1941. First the family lived in Zagerijstraat, later in Pannenhuisstraat 144.

Barely two months after the birth of their daughter Mireille, the family was arrested at home on June 9, 1944. Only father Jacob could escape barefoot through the garden wall. With the help of Lierenaars he could go into hiding in Emblem until the end of the war. He returned to Lier and waited for his wife and children. After learning that they had died, he left the city and settled elsewhere.

Mother Dyszka Zolty (34) and children David (7), Berisch (4) and Mireille (2 months) were taken to the Dossin barracks in Mechelen. On July 31, 1944 they left with the last transport to Auschwitz, where they were murdered on August 2, 1944 ".