Spent at least one summer weekend with my wife at a resort which happened to be hosting a "gathering of all paths". One guy set up shop to "photograph people's auras". Funny thing, but all the auras were in just the same shades as his multi-hued backdrop. Now, just because all it would take to get the effects he did would be something at the technical level of a little hair spray on one element of his lens, doesn't mean I would ever suspect him of being a charlatan...   (And no, I don't think my opinion about him proves anything one way or the other about auras)