Glaskubus, Holocaust memorial monument in Planken district, Mannheim, Germany.

The Glaskubus is a hollow, transparent glass cube three meters on each edge, set on the Planken pedestrian zone in front of Quadrat P2. It is rotated 45 degrees so that one axis points toward the center of Paradeplatz. The four vertical panes carry 2,280 names engraved on their inner faces, which appear in mirror writing from outside; the names can be read normally only through the opposite pane.

The monument was erected in 2003 and commemorates Jewish citizens from Mannheim who were persecuted and killed during the Nazi period. Its establishment reflected the city's commitment to making this remembrance visible in the public sphere.

The engraved names on the interior glass panels appear as mirror writing when viewed from outside, creating a reflective visual experience. This arrangement encourages visitors to engage actively with the inscriptions and interpret them in a personal way.

The glass cube is freely accessible during the day and night, with nighttime lighting making the names clearly visible. Visitors can approach the monument from any side at any time without scheduled hours or special arrangements needed.

The structure was deliberately designed as a transparent cube to keep the victims visible rather than hidden away. This integration into the daily life of the city means the memorial serves as a constant reminder while remaining part of the living public space.