@IngridHbn

I had one when I was a child. And a cardboard box with stereoscopic pairs of Barcelona, ​​where we had visited with my parents (We lived in Lérida, 140km. away)
It was at home for a long time after the photos were lost. Some time after it disappeared I became interested in stereography again, and learned to visualize stereophotographs with the naked eye. Today, presbyopia and age have greatly diminished that ability.

flickr.com/gp/fotero/K279253C3