The answer lies in its construction and sound production. The hole on the bottom of the kalimba helps to amplify its unique sound when it’s played. It also allows air to move through, creating resonance and vibration which produces a richer tone. Additionally, this opening can be blocked by pressing down with your thumb while playing, giving you control over different sounds you can produce on the instrument. Not only does this hole give the kalimba its distinct sound and resonance, but it also serves as an important reminder of its history and culture.