Security cameras also don't always look like security cameras...but most (especially Nest devices) do. However, if I was trying to find out some kind of nefarious activity within my home, I wouldn't put up an obvious security camera, unless it was to redirect the potential perp toward somewhere that has the actual camera - hidden as a book, or something similar - ideally, it fits right in with its environment, and doesn't look at all out of placce...