Whither reality?

I have just read The Goalie’s Anxiety of the Penalty Kick by Peter Handke (first published in German in 1970) which is basically the story of a man losing his grip on what we would call reality. Words and the things words signify become increasingly separated. Here is a brief extract which appealed to me:

“He was relieved to discover a square on the map that he could not find on the landscape: the house that had to be there wasn’t there, and the street that curved at this spot was in reality straight. It seemed to Bloch that this discrepancy might be helpful to him.”