Historical clue formulations

• Like the layout of the central 13 black squares in this puzzle — 2026-03-07
• Like lowercase i's and j's — 2025-12-14
• Like some letters and lines — 2021-01-09
• Bottom of a contract — 2013-08-18
• Like some lines — 2011-12-25
• Like some notes on a music sheet — 2006-07-15
• Like some lines — 2004-08-19
• Like some lines — 2003-10-22
• Like Seurat paintings — 1997-06-01
• Like some lines — 1996-03-24