It is called a Busy-Body
Like an early form of caller ID, Ben Franklin invented this interestingly simple device called a busy-body. Attached to a 2nd floor exterior windows sill, this device allows you to stand inside your home, and see who is at your front door, without that guest or visitor know that he is being watched. So if someone is knocking at the front door of your Philadelphia Brownstone, perhaps selling sweepers, or magazine subscriptions, you may see who it is, and choose not to answer. All the while, the person knocking will have no idea that he or she has been seen. The set of 3 mirrors is angled so the image of your front door stoop is reflected directly into a window on the 2nd floor. Again, so you can see who it at your door, without having to answer your door. That Benjamin Franklin was one smart guy!
Prudential Fox and Roach REALTORS®
530 Walnut St., Suite 260 Philadelphia, PA 19106