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A little high-school physics: Why do we *see* things? Because of light scattering from them. So, if the camera *saw* the "apparition," why did nobody else on the scene see it? The CCDs in the cameras (if that was a digital camera) are not too sensitive beyond the visible range. Let's assume that indeed it was a "spiiiiiriiiit" and that the camera is quite sensitive in a wide electromagnetic spectrum. Judging by the blue color, the "ghost" must have been radiating in the short-wavelength range invisible to the naked eye (since nobody but the camera detects it), that is - close to UV-A radiation (such as the one used in tanning salons). For something to emit near-UV radiation of this intensity, it must have had quite a power source! Add to this the UV filtering properties of common glass, and the dilemma groooows... So, it's not UV, just plain blue such as, hmmm... from a bag or a mischievous computer geek with too much time on his/her hands...