Circumstantial evidence can be deceiving, as it often appears to indicate a clear direction or conclusion. However, a slight change in perspective can lead to an entirely different interpretation of the same evidence. This duality highlights the complexity and often unreliable nature of circumstantial evidence in solving mysteries.

The notion of shifting viewpoints emphasizes the importance of critical thinking and careful analysis when evaluating evidence. It suggests that what seems conclusive at first glance may require deeper investigation and open-mindedness, especially in unraveling intricate cases like those encountered in Sherlock Holmes' adventures.