Thanks for the feedback! Agree analogies are context (and time) sensitive. As soon as you make a reference the clock starts ticking about how long it would remain relevant.<p>For this specific example, I was writing to a high-school version of myself who wanted to really get an intuition for primes. What can we deduce from a prime factorization, are there other ways to think about it? (Number theory is studied later, even though numbers are introduced early.)<p>For a younger child, I&#x27;d probably use Lego or Minecraft to show how numbers can have &quot;building blocks&quot;. And if you didn&#x27;t use any Redstone as a building block, there won&#x27;t be any Redstone in the result. (I.e., a number which never had the &quot;2&quot; building block added, will never be even.)<p>Thanks for the comment!