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100 Things: #29 - marypoppins = (superman + starship) / god;
Rome wasn't burned in a day, you know. Wait, maybe it was.
pyran
pyran
100 Things: #29
Cone cells are cells in the eye that allow someone to detect colors.  Humans have three types -- one for red, blue, and green -- that allow us to see millions of colors.  Adding a fourth doesn't just add one color -- it would add the ability to detect thousands more.

With that in mind, the following I find fascinating:

- Dogs have two types of cone cells
- Humans have three types of cone cells
- Butterflies have five types of cone cells
- Mantis shrimp have sixteen types of cone cells.

In fact, the eye of the mantis shrimp has the most complex eye in the world.  Nothing else in nature comes within 50% of the complexity that has been observed in a mantis shrimp eye.

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fishsupreme From: fishsupreme Date: June 21st, 2012 08:54 pm (UTC) ((Link Me!))
What I always found most interesting about this is that the whole idea of "primary colors" -- red, blue, and either yellow or green depending on if we're talking lights or pigments -- is not a characteristic of light, but a characteristic of our eyes. If we had happened to evolve cone cells that detected slightly higher or lower frequencies, we'd consider those colors primary and make all the others by mixing those three colors instead. Likewise, to a bird there are four primary colors.
pyran From: pyran Date: June 21st, 2012 09:11 pm (UTC) ((Link Me!))
Or, in the case of the mantis shrimp, 16 primary colors. Can you even imagine? I can't.
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