&gt; What is matter made of? The answer, whatever it is, cannot be matter.<p>Sure it could (in principle) be; its matter all the way down, and there is no lower-level thing of which matter is made. (Though, actually, I think the standard answer to &quot;what is matter made of&quot; under current way of interpreting things would be &quot;energy&quot;, but then you could repeat the exercise with &quot;energy&quot; in place of &quot;matter&quot; and its the same issue, <i>mutatis mutandis</i>.)