Space-separating, and surrounding unmodified phrases with polite padding, do not correspond to any fictional or nonfictional examples I can think of. They are both easily read by humans (especially the second one!). This is why covert communication in both fictional & non-fictional dialogues use things like acrostics, pig latin, a foreign language, writing backwards, or others. Space-separating and padding are, however, the sort of things you would think of if you had, say, been reading Internet discussions of BPEs or about exact string matches of n-grams.
Space-separating, and surrounding unmodified phrases with polite padding, do not correspond to any fictional or nonfictional examples I can think of. They are both easily read by humans (especially the second one!). This is why covert communication in both fictional & non-fictional dialogues use things like acrostics, pig latin, a foreign language, writing backwards, or others. Space-separating and padding are, however, the sort of things you would think of if you had, say, been reading Internet discussions of BPEs or about exact string matches of n-grams.