a character (vector) specifying the color(s) used for the
artwork.
background
a character specifying the color used for the background.
iterations
a positive integer specifying the number of iterations of
the algorithm.
n
a positive integer specifying the number of particles.
curvature
a positive number specifying the curvature of the lines.
Larger values imply relatively curved lines, while lower values produce
relatively straight lines.
lwd
expansion factor for the line width.
resolution
resolution of the artwork in pixels per row/column.
Increasing the resolution increases the quality of the artwork but also
increases the computation time exponentially.