| Clue | Source | Date |
|---|---|---|
| Apartment door feature | Thomas Joseph | 04 Jan 2021 |
| Hotel door feature | LA Times Daily | 15 Apr 2020 |
| Place to take a peek | The New Yorker | 27 Jan 2020 |
| Podcast's certainly complete in a site for threading | The Telegraph Toughie | 11 May 2018 |
| Something to see through | Newsday | 13 Jan 2018 |
| Security feature of some hotel-room doors | The Chronicle of Higher Education | 06 Oct 2017 |
| I, perfect in speech, may be one to be seen through | The Telegraph Toughie | 05 Sep 2017 |
| Mask opening | Newsday | 15 Feb 2015 |
| Mask feature | ||
| It lets you see who's calling | ||
| Ghost costume cutout | ||
| Caller ID aid? | ||
| Ski mask feature | ||
| Feature of some doors | ||
| Door security feature | ||
| Circular opening | ||
| Socket | ||
| Feature of some apartment doors | ||
| Peeper's place | ||
| Peeper's post | ||
| Peeping aperture. | ||
| Item for peepers. | ||
| Opening to look through. |