Freesound Forums

I've been trying to figure out what this sound is, but I'm not sure what it is. Can anyone identify it?

Listen to it here: https://soundcloud.com/justinium/mystery-sound

Sounds like scratching the base of a medium sized container with the microphone placement at the rim; most likely plastic.

I was initially tempted to say it's mechanical by the oscillating nature of the sound.

Really, it could be anything, but it definitely involves a partially enclosed vessel, judging by the character of the reflections, or RT60.