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Thanks @lexicon! It's a bubble ring made using a bit of air in my mouth to make it into a doughnut shape :) one of my favourite things to do in the water, watching the ring expand and change shape as it float to surface!

Ok. I was wondering if those were air bubbles. I am glad you let me know. I would make air bubbles all the time too with shapes like that! I bet the kinds of shapes are limitless!

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