This puzzle is within the spirit of the What’s a Phrase/Phrase™ sequence began by JLee with a particular model of Phrase™ and Phrase™ puzzles.
If a phrase conforms to a particular rule, I name it a Nature Phrase™.
Here’s a record of Nature™ and not-Nature™ phrases:
|Not Nature Phrases™
What’s the rule to inform whether or not a phrase is a Nature Phrase™ or not? Why is it referred to as a Nature Phrase™?