"The Last Supper," e.g.

MURAL

Think of a large artwork that covers an entire wall or ceiling, often telling a story or depicting a historical scene—this one was painted by da Vinci.

This clue is asking for a term that describes "The Last Supper," Leonardo da Vinci’s famous painting covering an entire wall. The answer is "mural," which refers to any large artwork painted or applied directly onto a wall or ceiling. The example hints at the scale and placement of the piece rather than its religious or artistic significance. Think of it like a giant wall painting you’d see in a church or public space.