Historical clue formulations

• Copy — 2025-06-13
• Aid in self-reflection — 2025-01-16
• Something to look into — 2023-12-21
• Something to reflect on? — 2023-03-21
• Compact disc? — 2022-05-19
• Reflect — 2019-06-15
• Reflect — 2014-07-26
• Ape — 2008-01-25
• Fun house item — 2006-09-24
• Fun house fixture — 2006-07-19
• Item literally useful in reading the answers to 20-, 32-, 41- and 52-Across — 2005-10-06
• Kaleidoscope part — 2004-09-17
• Something to reflect on — 2000-10-27
• Medicine chest door, usually — 1998-09-29