Used to be a big deal when a teacher used one of these in class

Used to? the amount of schools and universities I know of actively using them is higher than I'd whish.

welkom to dschörmany I guess

Overheadprojektor :D <3

I still have some printer-compatible overhead transparency sheets I bought over 20 years ago in with our specialty printer paper.

The only Elmo I wanted to play with growing up