Bridges

What is it about the curve, the arch, that seems so pleasing?  Bridges over the Susquehanna River, Harrisburg, Pennsylvania.  

I grew up in Pennsylvania.  We are just passing through on our way to upstate New York. Our kids met us at Baltimore/Washington airport, then we drove north for a few hours.
~ The musician and "the kids" (daughter, SiL, and grandson) peer over the pedestrian bridge observing a snapping turtle on a log jam below.

Thank you so much for your kind and thoughtful comments yesterday, and for your many stars and hearts of late.  Apologies for lack of comments.