Children are fascinated by people whose appearance differs from what they’ve come to expect. And we teach them to ignore that interest. My daughter, Tarpley, once asked a cashier if she was a man or a woman. My husband flushed with shame for the discomfort it caused the homely, hirsute woman. He apologized but recognized that the damage was done. Afterward he explained to our daughter just how much that kind of comment must have hurt the woman. She doesn’t ask those kinds of questions anymore. She’s learned not to stare.
Medical school forces you to undo that training. You mustn’t avert your eyes from abnormality. You need to seek it out. You need to figure it out. And it doesn’t just turn off when you leave your office. I frequently (quietly, I hope) point out to my husband pathology that I see on the street—the rolling gait of a man with an above-the-knee prosthesis; the strange gray-toned tan of a man with iron overload syndrome, known as hemochromatosis, the schizophrenic woman’s restless lips and mouth, a long-term side effect of many antipsychotics. I now live in a world filled with abnormality. It’s fascinating.

- Lisa Sanders, Every patient tells a story

I think I can speak on behalf of people who are bilingual or speak more than a language and confirm that..

You'll always feel like there is a language barrier between you and someone who's monolingual, its more complicated to express your thoughts without slight hesitations

On that thought,
I kinda feel like it's the same when it comes to Professions.

If you're a professional in your field and you invest much of your time and energy in it. Whenever you would have a long enough conversation with someone, you're gonna be hit with that same "language barrier" feeling

.

Actually, this made me think of how we use metaphors...

Bonheur des parents,
By Jean-Eugène Buland

صاحِبُ السلطان كراكِبِ الأسد: يُغبَطُ بموقِعه وهو أعلَمُ بموضِعِه

- علي بن أبي طالب (ع)

Bij de-at the-fontein

Pleasant Burden
_by william Bouguereau

What do they call the feeling of nostalgia for an "imagined" perfect past, not even a real one?

On a second thought, almost all nostalgia is a feeling of longing for an imagined past, not a real one.
The perfect past is only perfect as we remember it now (not as we lived it). It's only perfect as a past moment, as something we can look at from a distance. Just as we enjoy war movies because we're watching them through a screen, and not actually living through the war.

I guess nostalgia is simply: The past, beautified and reimagined. By feeling nostalgic, we create a myth of a blissful past so we can distract ourselves from the imperfect present... Which is not necessarily a bad thing to do.

جَفنُه عَلَّمَ الغَزَل ومِن العِلم ما قَتَل
فحرقنا نفوسنا في جحيمٍ من القُبَل
ونَشَدنا ولم نَزَل حُلُمَ الحبِّ والشباب
حُلُمَ الزهرِ والندى حُلُمَ اللهوِ والشراب
هاتِها من يدِ الرضا جرعةً تبعثُ الجنون
كيفَ يشكو من الظما من له هذه العيون