I was a little skeptical - after all was it really tricking me into thinking it&#x27;s 3D? Or is this just an odd visual artifact? Then I read:<p><pre><code>  Notice how the shaft now seems tilted to the left? 
  (Did you just catch yourself shifting your head to 
  the right? Convincing isn&#x27;t it?!!)
</code></pre>
And I realized I had just moved my head to the right to center the shaft without realizing it. I laughed out loud when he caught me on it.