PRISMS
| Date | Clue |
|---|---|
| 2026-07-19 | They're at the ends of some rainbows |
| 2026-05-09 | Color separators |
| 2025-06-28 | They have many faces |
| 2018-04-09 | Light-refracting objects |
| 2014-05-01 | Some glass paperweights |
| 2007-07-14 | Dispersion devices |
| 2007-01-23 | Beam splitters |
| 2002-08-15 | Light dispersers |
| 2001-08-03 | Periscope parts |
| 1994-10-23 | Drops of water, e.g. |
| 1994-02-23 | They make colorful displays |