Look at how the shadows are formed along the doji and compare them with the total value of the stock. You might notice a dramatic shift where a stock went up or down by several percentage points but then fell back down to an earlier total. For instance, a stock that opened at $50 might have closed at $49.50. You might notice a dragonfly doji here where the stock went down to $45 before catching back up. The doji is symbolic of how the stock might end up heading down in the future. It would be harder to understand a signal if the doji shadow went to $49 before moving back up. You would have to watch for another couple of candlesticks to see what could be happening.