You can see the slow movement in this artwork, the thickness of the waves are slowly graduated. And the waves are curves on the same direction. In the beginning to started this project, I want to do something gradually on the curves and the thickness of the waves. The final result I got this image.

You can see there has two black colors, one is darker tone and one is like a grey tone. This is my mistake, because I had use two different black sharpies. One of the sharpies is like transparency, that’s why their have a grey tone.