We discussed how perception in part reality, part biology, and part culture.
We saw the Gorilla video on YouTube. Some people don't even see the gorilla, but everyone in this claims claims that they did.
We looked at the physics of light, and the biology of vision. The I asked why there are 7 colours in the rainbow and argued that it is just because somebody made that up.
I fantasized about being the leader of North Korea and changing the way everybody names colours.
The way we think about color is very cultural. Irish has no word for pink. This interesting article from Wikipedia on the Japanese color 青 and this article on distinguishing blue from green across cultures make the same point quite well.
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