+
+If you wanted more pronoun-classes to reduce the probability of collisions (where universal [Spivak _ey_](https://en.wikipedia.org/wiki/Spivak_pronoun) or singular _they_ would result in more frequent need to repeat names where a pronoun would be ambiguous), you could devise some other system that doesn't bake sex into the language, like using initials to form pronouns (<em>K</em>atherine put <em>k</em>er book on its shelf?), or an oral or written analogue of [spatial referencing in American Sign Language](https://www.handspeak.com/learn/index.php?id=27) (where a signer associates a name or description with a direction in space, and points in that direction for subsequent references).
+
+(One might speculate that "more classes to reduce collisions" _is_ part of the historical explanation for grammatical gender, in conjunction with the fact that sex is binary and easy to observe. No other salient objective feature quite does the same job: age is continuous rather than categorical; race is also largely continuous [(clinal)](https://en.wikipedia.org/wiki/Cline_(biology)) and historically didn't typically vary within a tribal/community context.)