<p><img src="https://imgs.xkcd.com/comics/sky_color.png" alt="Feynman recounted another good one upperclassmen would use on freshmen physics students: When you look at words in a mirror, how come they&#x27;re reversed left to right but not top to bottom? What&#x27;s special about the horizontal axis?"></p>
<blockquote>
<p>"<a href="https://xkcd.com/1145/">Sky Color</a>", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License</p>
</blockquote>
<h2 id="alt-text"><a aria-hidden="true" class="anchor-heading" href="#alt-text"><svg aria-hidden="true" viewBox="0 0 16 16"><use xlink:href="#svg-link"></use></svg></a>Alt Text</h2>
<p>Feynman recounted another good one upperclassmen would use on freshmen physics students: When you look at words in a mirror, how come they're reversed left to right but not top to bottom? What's special about the horizontal axis?</p>

xkcd

Sky Color


# XKCD

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