So I was looking at the Astronomy Picture of the Day for today, Galaxy Cluster Abell 1689, (August 24, 2010) and I started to think about how much we still don't understand about the universe.
The photo dealt with gravitational lens deflections and how it is helping us humans theorize about the universe.
Then it hit me! We are like mere fish in a fish tank.
Think about it: When you look into a fish tank the water acts like a lens and can distort the image we see. Sometimes it doesn't distort at all perhaps dark matter is the same way.
I wondered if fish in the tank in my living room have been developing theroies about the things they see from their fish tank.