Writing question from 2008-2009 sample PSAT

<li>The best photographs in the exhibit tease, they catch the viewer between the strange and the familiar.</li>
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<p>The given answer says that the underlined part should be “tease: they catch”</p>

<p>I just don’t understand why a colon is necessary there… i thought it would be a semicolon</p>

<p>"they catch the viewer between the strange and the familiar" provides information to what tease is, meaning "they catch.." cannot be an independent clause because it does not mean anything by itself. Thats how I got it. Somebody else with a better explanation?</p>

<p>Thanks, I haven't been doing these long enough to come across a sentence like that...</p>

<p>Wait, the second part of the sentence is an independent clause, isn't it? Or am i missing something?</p>

<p>It is an indepedent clause.</p>

<p>Either a colon or semicolon would be fine in the sentence. Did the answer choices include both?</p>

<p>one of the answer choices did have a semi colon, but it had a subject-verb disagreement error. I haven't seen a colon separate two independent clauses, which threw me off.</p>

<p>Yeah, I believe for that question the other choices had an error, so the colon one was the best one.</p>

<p>Yep, I remember the incorrect semicolon choices,
An0maly is right; the colon one was the best one.</p>