Cathedral

The narrator can not describe the cathedral to the blind man because he has never seen one in person he has just seen them on television. He has never had to describe anything to someone who is blind or can't see. He might of had the feeling that he didn't understand some of the words he used to explain a cathedral.
It tells the reader that he is not religious and never been to church. He wasn't really sure himself what the cathedral looked like except for what he saw on television. He did his best to try to describe it. But after he tried to described it they drew it together on paper. This made him realize what it was like to be blind.