古柱的回响之谜

Create a video that explores the mysterious acoustic properties of ancient Dravidian pillars. Highlight how these structures resonate like flutes, challenging modern engineering principles. The video should cover: 

- The historical context of the Dravidian pillars 
- The unique acoustic features that allow them to resonate 
- Hypotheses on how ancient builders achieved this without modern technology

Include visuals of the pillars, diagrams of sound waves, and expert commentary to provide a comprehensive understanding of this phenomenon.