We saw this dreamcatcher at a footpath leading in to Zion National Park. It had little locks attached. I don't know the purpose of the locks but I suspect that people would purchase them and place it with the hope a wish would be granted, just my speculation.
Dreamcatchers originated with Ojibwa, a Native American people. They have been adopted by other tribes as a symbol of unity. I think it makes an interesting shadow.
You can find other interesting shadows at Shadow Shot Sunday, hosted by Tracy at Hey Harriet.