Part of an interesting video series, Do You See What I See. The first part of this link shows an African tribe, the Himba, whose language and environment differ so much from ours that they are able to distinguish different shades very differently from us. The link below is for the part that shows the Himba tribe. At the bottom of the video player are links for the rest of that show.
Here an article about how those same people are able to discern optical illusions better than people who live in modern societies.
The Astonishing Vision of Namibia’s Nomads
“The Himba people of Namibia can see fine details and ignore distraction much better than most other human beings – a finding that may reflect the many ways that modern life is changing our minds and abilities.”