/span>))</code></pre></div>
<p><img src="Introduction_files/figure-html/unnamed-chunk-18-1.png" width="700"></p>
<p>Because these three-dimensional representations can be challenging to interpret given the distortion of displaying a three-dimensional surface in two dimensions, the <code>image()</code> method provides a “flat” alternative to convey the same information using the same semantics:</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r"><span class="kw">image</span>(