If I held true that every morning the Sun rises from the West, it would be true for me, regardless of its validity in comparison to my observation to the physical world. It would be an invalid estimation, but it would still be true.
As for senses, we have only a handful of senses at the moment, but that does not mean that we could not have more inactive or potentially. Those we have now are mostly due to pressure of natural selection, not from purposeful research and development.