| Clue | Source | Date |
|---|---|---|
| Theodor W -, Frankfurt-born philosopher whose writings include Prisms and Negative Dialectics | Mirror Quiz | 12 Dec 2024 |
| Commercial suggested as an alternative, gets a negative response from German philosopher | ||
| Theodor W. --, German philosopher, sociologist, and music critic | The Telegraph General Knowledge | 14 Dec 2020 |
| Relief ornament |