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I found the convex mirror at an outdoor flea market on a cold Saturday, half buried under a stack of picture frames that a vendor clearly considered less interesting than whatever else was on his table. It is round, about fourteen inches across, curved gently outward, set into a plain black wooden ring that shows real wear along the bottom where it must have hung near a doorway for years, catching bumps from coats and umbrellas.
What a curved surface does to a room
A flat mirror shows you a fairly literal version of whatever is in front of it, scaled roughly one to one, edges lining up the way you would expect. A convex mirror does something else entirely. Because the glass curves outward, it compresses a much wider field of view into the same small surface, which means my entire living room, the window, the doorway, the edge of the couch, all of it fits into this fourteen inch circle, bent and curved at the edges the way a room looks reflected in the back of a spoon.
Straight lines are the first thing to give up their straightness. The doorframe across the room, which is perfectly vertical in reality, curves gently inward as it approaches the edge of the mirror’s reflection, the way distant railway tracks seem to bend if you look at them through a fisheye lens. Furniture near the center of the reflection looks close to its actual proportions, but anything toward the edges stretches and narrows in ways that took me a while to stop finding disorienting.
My neighbor, seeing it for the first time, stepped back from it twice before she would stand still long enough to actually look, saying it made her feel like she was standing somewhere slightly different than where her feet actually were.
Where I decided to hang it
I put it in the entryway, on the wall opposite the front door, mostly because that seemed like the traditional place for this kind of mirror, sometimes called a witch mirror in some of the reading I did afterward, historically hung near entrances partly for the practical reason that a curved mirror shows a wider angle of a room in one glance, useful for seeing who or what is approaching before they are close enough to see clearly.
Whatever the history, in practice it means that from the kitchen I can glance toward the entryway and see, in a small curved circle, almost the entire front hall at once, the door, both side windows, the edge of the coat rack, all compressed into a single reflection that a flat mirror the same size could never manage. It is not a substitute for a normal mirror. I would not use it to check how a shirt looks or to see if there is spinach in my teeth. The image is too curved, too distorted at the edges, to be useful for anything requiring accuracy.
What it is actually good for
What it is good for, it turns out, is exactly the kind of ambient awareness a flat mirror is bad at. Sitting in the next room, I can catch the shape of someone moving through the entryway in the curved reflection long before I would notice them through a doorway or a flat mirror positioned to show only a narrow slice of the same space. The distortion, which makes the mirror useless for vanity, is precisely what makes it useful for this other, more peripheral kind of seeing.
Guests almost always comment on it, usually by stepping in front of it and watching their own reflection stretch and compress as they lean side to side, testing how far they have to move before the curve stops being noticeable. Children in particular seem to find this endlessly interesting, more interesting by a wide margin than any flat mirror in the house, though I could not tell you exactly why bending your own reflection is more compelling than simply seeing it accurately.
I have thought about buying a second one, for a different wall, somewhere that might catch a different kind of view, the stairwell perhaps, or the corner of the kitchen where the room turns a blind angle. I have not done it yet, partly because I am not sure a second distorted mirror would add much to a house that already has one, and partly because there is something about the singularity of it, this one curved surface bending this one particular room, that I do not want to dilute by repeating it somewhere else.
