If mathematics is created by men/women, why do we sometimes feel that mathematical truths are objective facts about the world rather than something constructed by human beings?
This is because we have the ability to prove many of mathematical truths and theories, these are called axioms. A mathematical axion is usually a proof that has been established and accepted because they are proven to be evidently true. By using our knowledge in maths, theories that are unable to be proven false are automatically axioms that humans see as objective facts. These proofs (such as the origami proof) can often be seen and applied in the real world accurately, therefore humans see them as objective facts rather than other objects/ideas constructed by human beings.