Camera obscura

Tonight there will be an annular eclipse over Asia and the US.  Anyone who knows anything about solar eclipses (and we like to pretend that’s all of us don’t we?) knows that you should never look directly at the sun.  I remember when we were kids, and tried to make a pinhole camera to watch the solar eclipse.

It went a little something like this…

Incidentally, this is kind of like how your eye works.  Light comes through a small hole and lands upside down in a dark room (known as your eye).  Our brains ping the image the right way round again.  What if there are people whose bit of the brain that does that is damaged?  Do they see the whole world upside down?

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