Have you ever been on a trip, only to discover at some point that you are lost? You may have been traveling by car, or bicycle, or public transport, or even walking. You were heading blissfully down the road, thinking all was well. You felt certain that you were moving toward your desired destination. Then you began to pass landmarks that indicated something was wrong. You may have felt disoriented or alarmed. Finally, you saw a sign with the correct destination, but it was pointed in the exact opposite direction from where you were headed. Well, what did you do? First, at your earliest opportunity, you stopped moving in the route you were traveling. Then you turned around—you did a 180 degree turn, and began moving in the opposite direction—this time toward the right destination, not the wrong one.