Considering the heft and cost of each one, it's VERY interesting to consider how much monumental movement there has been over the last - how long? When was the first statue moved?

What I'd like to see is an interpretive timeline of movement. Far more than anyone realizes, I'm guessing. Kind of puts a dent in the metaphor/cliche "carved in stone."

Some, maybe all, will be discussed in Penny Bach's book, Public Art in Philadelphia. (Temple Press, 1992).