But of course, saying it like that, or even thinking about it primarily like that would be bad person skills. The frame of reference here is your friend, it's a personal event that happened to him or her, and your friend's feelings and reactions to the situation are what should take priority here when calculating a response (assuming he or she is sufficiently "in-frame", otherwise the previous musing might be... more fitting than usual).
Extreme hypothetical aside, the original sentiment is something many can agree on, I think: correct scale is important. Now that we've established that, let's go z-axis: depth. Not just thinking too big or too small, too grand, too long, but thinking about something too deep.
Now, hear my tale.
I was watching something on YouTube - it was a FineBros production, their famous "React" videos. The format is that they (the Fine brothers, Fine is their surname) have a group of people (kids, teens, elders, other YouTubers) and the Fine brothers show the group something - usually a video. Afterwards, the Fine brothers ask the group questions about what they just reacted to. During the "reacting" part of the video (and during the interview part as well actually), the screen cuts to different people of the group - the reactions and interviews are done separately for each group member usually. When the screen cuts, for visual consistency (I think?), whomever is on camera tends to be in the same relative position on screen - the seating and camera are arranged such that a person's face always occupies more or less the same area on the screen. This is key for the following... chain of events that happened to me.
Spacing out while watching this, I was focused on the "face" area of the screen - blankly but intently focusing on the faces. The primary visual stimulus that was being registered to me was the... skull shape of people. The "face" part of the bones. Think "it hit me in the face" vs "it hit me in the head", just the face area of that. Eyebrows, eye sockets, cheekbones, noses, upper incisors and maybe canines. That area has remarkably small variation in between individual to individual, I found. The cheekbones could be the most varied, then the brow and eye socket maybe - but with a smaller range of variation than the cheekbone.
Then I started focusing on the cap. The dome. The neurocranium. That area has really little variation. It isn't always so clear to see, but excluding the hair, it seemed there was very little that could be different from individual to individual. Also, the hair tends to cover up the detailed topology, so only broad strokes can be noticed through ocular investigation without manipulation.
Of course after that is the jaw. Lots of variation available here. I guess this is why the jawline is such a notable factor in differentiating how people look. High school biology talk here, but, the mandible is my favourite bone in the body. The way it occupies three axes, the delicate touches and variations, the strong and firm overall form, the way it fits into the cranium. Simply amazing. Even more so in motion. Anyways.
After intently watching the bone structures, the flesh came into focus for me. The most interesting was how it covered the whole set-up, but that's a different story. I kept my focus on how it fleshed out the portion between the "two peaks" of variables in bone structure: the area between the cheek bone and jaw. Basically, the cheeks. "Cheek line", naturally, is a big factor in how a person looks. Although I prefer the cheek area to be fully filled and well fleshed out, looking at it from the bone-out it was quickly obvious that less fleshy cheeks make it much easier to observe the cheekbones and mandible. I mean, that's pretty obvious, but man, that was all I could think about at the time.
Movement. When they talked, when they moved their jaw around. How the flesh would pull at the cheekbones, bringing clear definition. How the cheek flesh would move about, like lines defining the relative positioning between two points dancing in accordance. Movement vectors, the cheek viewed as a multitude of lines rather than a single shape. And yes, of course, the movement of the mandible itself. The best part was seeing the cause and effect all in the same place - parts of the cheek would cause the motion of the jaw, other parts would move as a consequence. Cause and effect, tied together by a remote factor, the motion of the mandible.
Anyways, this whole thing weirded me out after a while - I only focused on bone structure and flesh conformation of human faces for one video. Still. Lessons learned: 1. look to deep into one thing and things will get weird (as mentioned in the beginning), 2. anatomy in motion is fascinating, and 3. maybe I'm now starting to learn about beauty standards.
tl;dr > I stared at faces for too long until all I could focus on were the bone structures, then I got weirded out.
Border cells. Always trying to learn about the intermediate by defining the extremes.