While I’m on a 50’s fashion theme, here’s a nice shot of two 1950’s ‘maths teachers’ conferring in front of a chalkboard (blackboard to my British friends). I’ve sadly got no original attribution for it. The lady on the left looks vaguely familiar, but I can’t place a name. A reverse image search gives me vanilla 50’s fashion sites mixed in between the femdom sites. I assume the stick was designed for pointing rather than beating, but clearly there are plenty of perverts out there (and in here) willing to imagine other uses for it.