Hundreds of people turned out Monday, some leaving flowers and others stopping to pray before the wall (on Fullerton).
Officials from the Illinois Department of Transportation believe the shape is caused by salt run-off from the overpass above.
I-DOT spokesman Matt Vanover, however, says his agency has no intention of scrubbing the image off. He says I-DOT is going to treat it as if it's a roadside memorial, as long as it doesn't pose a traffic or safety issue.
The faithful dismiss the idea that the image is just a salt stain. Paula Diaz pushed her 13-year-old son in a wheelchair for six blocks to view the wall and called what she saw a miracle.