When I was a child, my family often viewed photos in this way. I have many of them at home. They come from my parents' youth and their four-year stay in Egypt. It's a very precious memory. I fondly recall this form of photography.
Therefore, I thought about designing glasses with a slide viewer function. In a specially designed frame equipped with a lens, you could insert a slide and look at it against the light.
Thanks to the glasses I designed, you can "transport yourself" to the past. By visiting places from the photos, you can compare how the landscape has changed while simultaneously looking at the photo from the slide.