Historical clue formulations

• Art with tiles in fancy styles (that might produce smiles) — 2025-05-12
• Inlaid tile design — 2023-10-16
• Tile work — 2022-03-20
• Artwork with tiles — 2018-04-16
• "Navicella" at St. Peter's, for one — 2016-02-13
• Subway artwork, maybe — 2016-02-02
• Tile art — 2006-05-22
• Many a stained glass window — 2005-11-17
• Set pieces? — 2005-01-22
• Tiled art — 2004-10-26
• Fountain basin feature — 2004-08-04
• Composite picture — 2004-03-24
• Terrazzo, e.g. — 2002-12-28
• Fancy floor, maybe — 2001-05-21
• Subway tunnel art, maybe — 1998-09-17
• Tile work — 1996-04-09
• Inlaid design — 1996-03-25