title: What does { content: [Circular] } mean in JavaScript?
body: <p>My code was:</p>
  
  <pre><code>var chineseBox = {};
  chineseBox.content = chineseBox;
  </code></pre>
  
  <p>and it returned:</p>
  
  <pre><code>{ content: [Circular] }
  </code></pre>
  
  <p>What does that mean?</p>