The fundamental of short writing is the one-two-punch. Takes two elements of language and rubs them together for effect.
You can do this even in the shortest texts to add friction and spark to your writing.
Here are some examples of words that can be used as a one-two punch:
Heaven and hell
Good and bad
Black and white
Yin and yang
Justice and inequality
Money and meaning
Dualities create urgency in a writing. The one-two punch moves your readers from abstract to concrete, from general to specific, for problem to solution.
Your writing will improve when you can confront a real problem with two competing solutions.
A homework for you to practice this one-two punch is to create a one-two chart that consists of words that go well with each other. Also, in your reading, notice examples of comparison or contrast to keep a list of these one-two punches.
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