Information: Wikipedia

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.

List of Stolpersteine in the city of Aartselaar

Hoevelei 53: CAMILLE PAULUS

                       MARIA LUDOVICA DE VRIES

                       CONSTANCE CALLAERT

Camilius Leonardus Paulus, born July 3, 1882, in Aartselaar, married to Maria De Vries, a resistance fighter, who died in Neuengamme at the age of 62.

Maria Ludovica De Vries, born April 12, 1884, in Aartselaar, a resistance fighter, who died on December 15, 1944, in Ravensbrück at the age of 60.

Constance Callaert, a resistance fighter and the Paulus family's housekeeper, died at the age of 36 in Ravensbrück.