>what are we to use for a simile when chalk/fingernails on black/chalkboards are totally replaced by whiteboards and markers?
oh, tsuwm, it will be a PC expression, as those who are unfamiliar with it, decide it is racial.
A town on Long Island (lawng guylan) recently had to change the name of Guinnie Woods Road, since some 2nd and 3rd generation Italians (new to the area) thought it to be a slur on Italians.

It was named for a woods that provide fine hunting a 100 years ago for guinne fowl– a variety of chicken!