> The camera we’re talking about only sees the inside of the printer Devil's advocate, inadvertent peephole cameras and reflections in surprisingly small regio

> The camera we’re talking about only sees the inside of the printer Devil's advocate, inadvertent peephole cameras and reflections in surprisingly small regions of interest are a fact of how light interacts with glass, metals, low-tolerance parts, and the other sorts of things that make up the printer. There are lots of recent fun papers inverting the pattern going around a curved painted corner or through a hole accommodating the string holding up your blinds or whatnot to get a detailed view of what's on the other side. Their malicious use cases are probably less cutting edge.