as seen by a bird requires four, five, or six dimensions to solve the puzzle.
To a bird brain, all humans are profoundly
colorblind. A human being cannot know six-factor color as a bird
the edge of human comprehension.
How was such a thing discovered?
How can we ask and answer questions about the color seen by a bird?
What is the practical significance of this fact? What's the practical
significance of the common human colorblindnesses?
Explore further into Colorblind Territory