What have we learned about punishment?

I was browsing the commons on Flickr recently, and I came across this 1956 picture, taken in Richmond, Virginia. The picture got me to wondering how far we've come in more than half a century.

Old-school punishment

After all, in most schools, we still put elementary students in timeout, take away recess or make them change some color-coded card, indicating poor behavior.

We have our own detention centers at school, which we disguise with euphemisms like, Student Management Room.

We are 55 years removed from Richmond's Juvenile Detention Home, but how much have we learned?