Just as a fish doesn't notice the water it swims in, we generally don't notice our own culture. We grew up in it, it's the normal behavior, the common expectation. It isn't DIFFERENT from our own, it IS our own. It isn't "invisible"; it's just "unnoticed". We generally only notice things that are different.
Chat with our AI personalities
In the Harry Potter Universe, invisibility cloaks are made from the hair of a demiguise, a magical creature with the ability to turn itself invisible. These cloaks will eventually go opaque over time, which Harry's will not. He posseses a "true" invisibility cloak which originally belonged to Death.
Albus Dumbledore.
Coach Kelly has not said, and as private as he is about his private life is not likely to. Being no ones business but his own, the question is a bit inane.
They had different cultures.
The biguns and littluns lead two separate lives, which seem to overlap only when both groups attend meeting or share the shelters at night. Essentially, other than providing shelters and occasionally picking fruit for the littluns, the biguns just leave them to their own devices and take no responsibility for them at all.