It may be used w/ visualization/imagination - a way to communicate with unconscious & conscious mind, e.g., I close my eyes and let mind flow and I see colors, which usually tell me something about blockages of specific energy rays. Then let my mind flow again and other images pop up in association with previous images. So even if there were no physical and no observable evidence, there may be phenomenological or experiential utility to such experiences in understanding one's situation.
My therapist had this neat aura photo (professional kind) and we took auric photos from time to time. The very first one was muddy red (very difficult time for me), sunken aura, with a big hole in it. As healing process went along, the aura shot up - green, blues, purples, and vibrant red. The very last one was when I felt at peace and decided to terminate therapy - my auric photo came out white and tinge of violet with this little being-like thing on my shoulder lol. The colors did symbolically correlate to the specific issues that i had been working on during therapy, which I thought was very interesting. Could've been just me attributing connections. Not a big part of the healing process tho, except the very first and last photos.
My therapist had this neat aura photo (professional kind) and we took auric photos from time to time. The very first one was muddy red (very difficult time for me), sunken aura, with a big hole in it. As healing process went along, the aura shot up - green, blues, purples, and vibrant red. The very last one was when I felt at peace and decided to terminate therapy - my auric photo came out white and tinge of violet with this little being-like thing on my shoulder lol. The colors did symbolically correlate to the specific issues that i had been working on during therapy, which I thought was very interesting. Could've been just me attributing connections. Not a big part of the healing process tho, except the very first and last photos.