It's the sweet spot for a change in materials:
The inside corner.
It’s the perfect place in an interior, or in any type of architectural structure, to transition from one finish to another in the smoothest, most logical way possible.
I try to do this when I transition materials or paint colors whenever I can. Overall, it makes for a cleaner, more thoughtful, tidier look.
It gets rid of uneven edges, as well as that finish-change at the “outside edge," where it appears something hasn't been well thought out.
But, ultimately, it creates a more seamless approach to material changes.
Take a look below to see what I mean.
Image A: Here, the tile goes from side-wall to side-wall on the back wall only, dying into the inside corners. Image via: Design Sponge
Image B: The paint here is still inside-corner to inside-corner, because it wraps around the fireplace wall to the back wall, and then dies in that corner. It also dies into the inside corner at the mantle. Image source: Style at Home
The Sweetest Spot!
While you may run into situations where changing finishes on an outside corner are necessary, that inside corner is still the sweetest spot!
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Image D: Here, the wallpaper stops at the inside corner, next to the paneling. Image via: Scherping Westphal
Image E: More wallpaper dying into the inside corners, the perfect place to transition. Image via: Heydt Designs
Image F: Here’s an example of the wall finish dying on the outside edge. It’s okay, but doesn't appear as neat and tidy as the other examples, does it? Not only will that edge fray and possibly peel over time, but, upon close examination, it probably has a rather imperfect edge. It is much more difficult to get a perfect line or edge with an outside corner than an inside one. Image via: Lowe's