Man Invents Glasses to Give Short People a Height Advantage

https://en.wikipedia.org/wiki/Periscope#Early_examples gives prior art:

”Johannes Gutenberg, known for his contribution to printing technology, marketed a kind of periscope in the 1430s to enable pilgrims to see over the heads of the crowd at the vigintennial religious festival[which?] at Aachen.”

It's a periscope.