<p>I wrote a random essay that wasn’t really for anything and submitted it under prompt 5 (I wrote myself a UChicago-esque question to fit the essay I’d written) on the uncommon app. I got in. I’m now submitting that essay as my common app essay under a common app prompt.</p>
<p>Basically, if you think your essay is Chicago-worthy (kickass will do) then send it. You may, though, need to write a question to go with it.</p>