This is a collection of 100% pen mini-projects that i decided to share. Use left and right arrow keys to switch between them. 1: Draw a rainbow line using your mouse. The line pulses through the rainbow even after being draw. 2: Click to draw a line. Notice the black only ever goes round the outside of the shape, even when two lines cross. 3: Circle. 4: Use the up and down arrows to change the number of sides of the polygon. 5: Relax with the slowly pulsing rainbow circle.
