Concentric wave singularity spike wave.
<video controls autoplay loop> <source src="https://diqn32j8nouaz.cloudfront.net/vertical_spike_wave.mp4" type="video/mp4"> Your browser does not support the video tag. </video>
Previously:
https://www.homemadetools.net/forum/...971#post120027
https://www.homemadetools.net/forum/...188#post141676
