Here, there are some line studies that represent different feelings. I named the lines with different adjectives, such as excited, crazy, quick, nervous, angry, happy, jagged, sharp, delicate, flowing, or smooth.  All depends of your feelings. With your hand, you can transmit to a line whatever you want to express. A line can express endless qualities.

We can see how some lines flow with others. Some are subtle lines while others are more noticiable. This create a rhythm, in this case repetition of organic and delicate lines that produces calm and tranquillity among others.