 In light of this, philosophers may be wont to diagnose some constructionist talk as a careless (or even an intentionally provocative) error of talking about the object of construction using a representation when one should be mentioning it (thereby expressing a view about the referent of the representation rather than the representation itself). When Claudius Ptolemy offered a geo-centric theory of the universe in the second century CE, he thereby contributed to the social construction of something: namely, a geocentric theory of the universe. We can talk about how and when that theory arose, and how it changed over time, but in doing so we are simply talking about a representation (or perhaps a lineage of related representations). It would be a mistake simply to slip from those claims into saying that in constructing this theory he thereby constructed a geocentric universe. Hence, charity in interpretation alone may suggest attributing only the weaker claim to a constructionist  author.[10]