Tinkling / chiming sound plays while placing the small pallisades - what does it mean?

So I am working on fortifying my little carved out swatch of land. While doing so with the small sized pallisades, I keep noticing a tinkling sound, or a chiming sound that plays. It is very distinct, separate from the music, and isn’t denoting any other obvious activities aside from playing randomly after a pallisade or three placement.

Does anyone have any idea what this is? My theory is that placing pallisades must be considered a higher scored “event” for the calculations with my purge meter. There seems to be an increase on the meter as I place these - and that sort of makes sense.

If anyone else has any ideas, empirical or otherwise, please let me know.

Thanks!

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