"Who are you going to believe? Me or your lying eyes?

I've always thought that was a funny line from JR Ewing when his wife Sue Ellen walked in on him in bed with another woman on the television show Dallas.  

But, it's more true that not.

In this Slate article we learn that our brain will use context to 'tell us' what we're seeing.  Interesting.

These two squares are the same color!  Put your finger over the area where they meet and you'll see.

That should make all of us pause when we try to say what is true.