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<a class="anchor__link link" href="#1.1" aria-hidden="true">#</a> Recap
</h3>
<ul>
<li>Now we know about procedural abstraction and data abstraction.</li>
<li>We can isolate the way data objects are <em>used</em> from the way that they are <em>represented</em>.</li>
<li>We learned how to make pairs with <code>cons</code>, <code>car</code>, and <code>cdr</code>.</li>
<li>We can glue together arbitrary things with <code>cons</code>, not just numbers.</li>
<li>We learned about closure: the things that we