| Clue | Source | Date |
|---|---|---|
| Geography class prop | Thomas Joseph | 06 May 2024 |
| War-room hanging | Newsday | 20 Sep 2020 |
| Common classroom adornment | New York Times | 25 Aug 2018 |
| Common classroom adornment | ||
| Where the world is really flat? | LA Times Daily | 12 May 2016 |
| Planning office sight | Wall Street Journal | 11 Feb 2016 |
| Where the world is really flat? | ||
| War-room hanging | ||
| Hanging in a schoolroom. |