I have seen various articles and / or videos about a billboard in London for a BBC series about Dracula and its clever use of light and shadows. During the day, the billboard looks like this, with bloody stakes stuck into a white billboard:
As the sun goes down, a shadow in the form of Dracula's silhouette appears, apparently cast by the stakes:
All the articles I've seen on this seem to be making the claim that the silhouette is produced by shadows cast by the stakes, and the placement of the shadow and the stakes certainly seem to indicate that this what the ad wants to show you, but I am skeptical of the claim that the silhouette is actually being cast by the stakes. For one thing, the silhouette is very even, with no gaps
or overlaps, which seems implausible (and to some extent unnecessary to create the desired effect).
For another thing, there is only one light source, but if you look closely, you can see shadows cast by the individual stakes:
I'm also finding it hard to imagine how they are supposed to have created the detailed teeth light that with a single light source cast on some stakes. I suspect that this is actually being achieved by a hidden light source projecting from the front of the billboard, with a Dracula silhouette in front of it, but I have found very little in the way of skepticism about this claim — all the articles seem to accept at face value that the stakes are casting this shadow.
Can anyone give more definitive answers as to whether this is actually being produced as described?
Edit: Just noticed that one of the stakes has little teeth dangling from it, which might explain how the teeth are allegedly being produced:
I also found this video where someone claims to have created a 3D model to recreate it, and it certainly seems to be doing a passable job (assuming that the lighting is the result of ray tracing on the 3D model and not a digital effect), so maybe it's more plausible than I thought?
Edit 2: I realized belatedly that with the premise that there is a single light source it doesn't really make sense to say that there are "no overlaps", since these are opaque objects, so that source being blocked by two or more objects would look the same as it being blocked by only one object.