This thread is better without pictures.
Regarding the ‘graphic’ nature of the photos on the sign that the girls had, one would have to go very close to see the ‘offensive’ image. The illustrations seem to have been printed on ordinary letter-sized paper.
The offense was in the professor’s mind. Could she have been reliving and abortion or two that she had experienced?
Cellphone video of incident, posted to YouTube: http://www.youtube.com/watch?v=sLemX9QtUa4