
Picture the dilemma. You’re given four pegs – a round one, a square one, a triangular one, and one that’s shaped like an oblong. Your task is to neatly fit all four pegs into a series of holes. But you can only see three openings. And even those look like a tight fit. What’s worse, the people who really care about the pegs (well, three of them anyway) absolutely detest the new oblong thing. But the person who gave you the pegs insists that the oblong is by far the most important and you...