“In some versions of the story he invented the labyrinth on Crete, where they kept the Minotaur. Problem was, he didn’t think through the consequences. Made the labyrinth so intricate it was hard to pin down the beast if you needed to slay it. Not only that, it had a design flaw. With a simple ball of thread you could make a trail to find your way out…”

-Terry Pratchett & Stephen Baxter, The Long Mars