The GIA Cut Study Team, in their Fall 2004 Gems & Gemology ‘Foundation’ article, discussed a diamonds ‘pattern’. Part of their study involved examining diamonds for brightness with trained observers viewing the diamonds through a small hole in various white domes sitting above the stone. The domes had different black and white shapes and patterns painted inside to create repeatable lighting environments. But all these tests were done with one eye closed so that they could attempt to validate their computer results which also failed to consider the fact that humans have two eyes and a complex mind that interprets the dual visual data.