Historical clue formulations

• Artist known for his "impossible staircases" — 2025-12-16
• Artist M. C. ___ — 2018-11-26
• Drawer of paradoxes — 2015-07-31
• Tessellating artist — 2015-04-23
• Dutch artist noted for optical illusions — 2007-04-10
• "Belvedere" artist — 1998-10-10
• Collectible Dutch print — 1997-08-24
• "Relativity" artist — 1997-08-16