I considered maybe I can use the air to hang the Nostoc bacteria in the cave. I studied the working principle of the ultrasonic levitator and designed an ultrasonic levitating tool to levitate the very little nostoc in the air. The ultrasonic frequency is 100KHz. So the biggest diameter of things which can be levitated is 1.4mm. Also, it has light sensors, if the light sensor can not sense light for 24 hours, it will control the piercing tool to bore a hole on the roof of the cave, and make the light come into the cave. Hence, the Nostoc bacteria can undertaking its photosynthesis.
With the photosynthesis, the crystal will grow around the Nostoc bacteria. Those crystals will also be levitated if they are small, and the suspended crystal can form something like cloud. When the stalactite and nostoc grow larger than the max diameter, those will drop down and like rain.
I considered maybe this system can form climate change phenomenon in the cave.
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