;Design statement:
;What I want to show in the image is the season of fall. Strong winds are blowing off the leaves. Basically, I have three variations to exlore: background color, the number of "circles" in the background, and the shape of cyclone. Besides, I use some randomness when drawing the leaves, since the positions of the blown-off leaves are not easy to decide.


;Technique statment:
;I combined several techniques when drawing the images. 
;For the background design, I used region.compute-pixels! to create interesting shapes. The color is dependent on different value of n. The way I made the shape like this is the application of sine and cosine functions on different components of a color.
;For the cyclone design, I used the spirograph technique. Also, I employed some of the fractal-like images thought when I decided to have two cyclones in each picture: the smaller one in the top left corner and the bigger one in the bottom right corner. Moreoever, the shape of cyclones in each picture is related to the value of n. I made this by controlling the number a stamp should rotate to the number of n.
;As I have said above, the positions of leaves are random, but the times to draw the leaves is also controlled by the value n. Frankly, the computer will draw the leaves from 4 to 8 times depending on the n given.