Curious title, isn't it? Perhaps "Nymphe en pergola" would have been more comprehensible. Understandable, yes, but wrong! A bit of culture: in Greek mythology, a nymph is a female deity known for her sexual freedom and an undine is, in those times, her male counterpart.
As for the pergola and the gazebo, they may have the same shape as a gazebo, but the pergola is for strolling, while the gazebo is for lounging - which it is!
