Not to oversimplify it, somebody once said a good rule of thumb in interpreting a character is to find the good in the bad people that you portray and the bad in the good.

It suddenly struck me that that tiny pea, pretty and blue, was the Earth. I put up my thumb and shut one eye, and my thumb blotted out the planet Earth. I didn’t feel like a giant. I felt very, very small.

The fingers must be educated, the thumb is born knowing.