IMHO, that&#x27;s the lesson -- your mental model of the world <i>shouldn&#x27;t</i> have sharp categories. [1] If you use concepts such that things are either a heap or not-a-heap, &quot;you&#x27;re gonna have a bad time&quot;. Instead, you should recognize a smooth boundary between categories -- things are <i>more</i> or <i>less</i> heaplike, so you should be able to continuously reduce its rating as grains are added or removed.<p>[1] <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=11687391" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=11687391</a>