 Brown claims this is a priori (though still fallible) knowledge of nature, since there are no new data involved, nor is the conclusion derived from old data. Moreover, is it some sort of logical truth (for the latest and most technical challenge of this claim see Urbaniak 2012). This account of thought experiments can be further developed by linking the a priori epistemology to accounts of laws of nature that hold that laws are relations among objectively existing abstract entities. It is thus a form of Platonism, not unlike Platonic accounts of mathematics such as that urged by Kurt Gödel.