Fact #071

If you look up at a bright blue sky, you will start to notice tiny bright dots swimming around. These are your white blood cells, which do not absorb blue light very well and so let spots of light through the aforementioned vasculature in front of your retinas. They are usually invisible since you get ‘used’ to the shadows, but these breaks in them are visible as the tiny bright dots you see. It’s called the blue field entopic effect. http://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon

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