The word 'clue' is derived from the word clew and came from the Greek story where the hero Theseus lay a thread behind himself in the Labyrinth, so he could make his way out again. He hunted the Minotaur monster of Crete which had the body of a man and the head of a bull. I was taken by an imagined scenario: What if the Minotaur came across this thread in the caves? Following it one way leads out of the Labyrinth - the other to his death at the hands of Theseus - If he can discover the meaning of this simple thread he could decide his own fate.