Take a moment to observe the detail in the top-left corner -- then look again, and again. Click where it belongs in the full painting below -- drag to pan, scroll to zoom. You may adjust your guess up to three times.
The Garden of Eden with the Fall of Man, 1615
Jan Brueghel the Elder & Peter Paul Rubens
This wall carries traces left by others. Add to it -- a few strokes, a few words, or a photo of something you drew on paper.