This 600-Year-Old Painting Still Puzzles Art Historians

The Mérode Altarpiece looks like a simple religious scene. But hidden inside it, there are codes, symbols and visual clues that most viewers walk right past.

A mousetrap that represents the Devil. A carpenter unknowingly building the instruments of the Crucifixion. A child passing through glass without breaking it. Every detail in this painting was placed there for a reason.

What are the hidden codes inside this 15th-century masterpiece? And how do you decode them?

0:00 Introduction
0:51 Right Panel: Joseph
4:51 Central Panel: The Annunciation
7:45 Left Panel: Donors