Nude Dancers

It's not every day that you run across something like this.  If the photographer was going for porn, he clearly missed the mark.  These three 4x5 transparencies have to be photos of some sort of performance.  But what kind?  Nude ballet, modern dance, Oh! Calcutta?  I once worked with the brother of a woman who was in Oh! Calcutta.  I won't mention her name.  Things that seem reasonable at twenty can be embarrassing at fifty.