My cousin Guru sent me a video on our WhatsApp group, which showed someone sprinkling a sand-like substance on a plate and producing various patterns. So I immediately started googling about it, and came up with the following:
This is called
I then got this information about Ernst Chladni himself:
and the following videos:
I am amazed by several things. First, that resonance can produce such patterns. Secondly, that there is so much in the world that I have to know about. Thirdly, the power of the internet, that places so much information before just by the click of a few keys!