Teachers who have found themselves holding class over Zoom have probably already figured out clever hacks to show their students documents, but there’s now an app designed specifically for that purpose (via 9to5Mac). Overviewer was made by developer Charlie Chapman, and it allows teachers (or anyone, really) to easily use their phone’s camera as a replacement for an overhead document viewer.
If it’s been a minute since you were a student, or if your school didn’t have these overhead devices, they’re basically webcams pointing straight down that allow teachers to show students a printed document, book, hand drawing, or other piece of writing or image. It’s a useful ability to have, but many teachers are working from home because of COVID and may not have access to one like they would in the classroom.