Related Clues:

• Wall art
• Rivera work
• Hard-to-move painting
• Lengthy painting
• Community art project, maybe
• ''The Last Judgment,'' e.g.
• Wall painting
• Subway artwork, perhaps
• Fresco, e.g.
• Subway artwork, e.g.
• Picture on a ceiling
• Big picture?
• Work on a wall
• Michelangelo's "The Last Judgment," e.g.
• Chagall piece