The client coordinated with her bf's mother and located the very sweet Harry Potter eyewear from his youth (uppermost), through the ages of wire & half-wire ovals, to the recent very mature designer specs by Armani and Face à Face (lowermost two).
I decided that this project could and should be done adhesive-free. I first tried sewing them down to the matboard using elasticized thread for its great gripping ability. I would only need to sew in two key places.
But then I hated that it was so visibile.