There was once a blind man, who in addition to not being able to see, also had a bald head. For a misdemeanour he had committed, the king put the poor fellow in a specially built prison designed like a maze or labyrinth.
The prison had a number of false doors and one real door, which opened and led to the light of the outside world. By the king’s order, anyone who could find the real door could step through it and immediately gain his freedom.
For a long time the blind man felt his way carefully around the prison’s wall, searching for the one real door. But as it happened, every time he actually came to it, he was distracted by an itch on his bald head. As a result, he scratched his head each time that he came to the door to freedom and, as he meanwhile kept moving slowly along the prison walls, he missed the one and real door over and over again.