I'm aware of the phrase second nature:
second nature
a tendency or habit that has become characteristic or instinctive.
"deceit was becoming second nature to her"
Is there something that means "first nature"? Example sentence:
His light, like air, had become __ to her.
(Maybe "first nature" is common enough? And applicable in this situation?)
Note: By "first nature" I mean, things that are fundamental to us like food, shelter, air, etc.
Best Answer
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You seem to mean something that already occurs and has not been learned.
The possible words you are looking for are
Depending on your perspective, a related term might be
which describes someone who is mentally handicapped, but brilliant at one particular thing.