These are found in many photographs taken in known haunted or paranormal locations. They usually appear as circular white balls of light, but can be a variety of colors. Sometimes they appear solid and other times they can seem transparent. Orbs are widely believed to be concentrated energy created due to paranormal activity, or the actual manifestation of a spirit in the form of energy. Orbs have been documented in both still photos and video footage. Although a majority of suspected orbs can be explained by dust particles or bugs, others remain a mystery.