@Drkedrkedjon @cmconseils
It's very important that no one paints over the silhouette with any permanent dye like methylene blue. It is sold without restriction as a fish-tank cleaner. That would be a nightmare to clean off. There may be ways to impregnate dye into stone and then seal it in, and it would be important that no one did that either. I'm sure other more learned minds will be along directly to highlight things that would increase the permanence of this silhouette, so they can be avoided.
If and when the artwork is finally eradicated, placing carefully computed objects between the wall and each surrounding source of street light might create the same effect at night, using shadow rather than ink to create the silhouette. This usually doesn't require permission of the wall owner. The inverse of this, which people must avoid of course, would probably be repainting the silhouette with indocyanin green dye (or similar), and replacing all the street light sources with bulbs that output UV as well as visible-spectrum light. This would not be visible by day, but the shape would appear by night, faintly glowing under the UV, as if a ghost.
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