It’s a kind of literary game.
Sentences must have exactly six words.
Apparently someone wrote a whole book!
The New Yorker reviewed it recently.
The reviewer played the same game.
All his sentences had six words.
What about five word sentences?
Could that also be expressive?
Or would it become restrictive?
Guess you’d have to try.
It never hurts to experiment.
Four might be hard.
There aren’t enough words.
Gets way too terse.
Sounds like bad Hemingway.
Three is ridiculous.
It becomes constricting.
Words fail me.