This talk is great! And if you watched it all the way to the 6:30 mark, where he says &quot;you can&#x27;t have negative amounts of light&quot;, then you&#x27;ll <i>really</i> enjoy chimerical colors: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Impossible_color" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Impossible_color</a><p>The trick is you exploit retinal fatigue in order to perceive colors both &quot;above 100%&quot; and &quot;below 0%&quot;. Wild stuff.