posted on Jan, 31 2008 @ 11:50 AM
I was thinking possibly 'watermark' - but it is a digital image... and not sure if there is a 'backside' to have been 'stamped with a seal'
FB.. have considered the possible 'filter artifact' - but perfect concentric circles is highly unlikely.
'Lens' is possible, but the image area in question fits perfectly into the shape of the manifestation.
Great input. I am sure that someone here will exact the example.
Thank you in advance.