I think it's angle and having only one poor quality picture. This is essentially a sculpture, and like most sculptures it is meant to be seen in three dimensions from multiple agles; not a single low-res photo. The artists' sculptures were made in the 90's so that is why the photos are so bad.

Search the artists or this work title and you'll see they did a lot of literally-trash sculpture-and-shadow-play like this. One warning, at least one is head portraits made with dildos.