The images below are generated using perl module GD.pm. This page is an example showing how "GD" can be used to create images on the fly (real time). The idea for this web page came from an article by Jimmy Ball that appeared in the November 97 issue of the Linux Journal on page 48. The image on the left is made of two gif images. The arrow gif is placed on top of the second gif image. The image on the right is also made of two images, but in this example the arrow is generated on the fly by GD from a mathmatical description of an arrow. Each time the page is refreshed, the arrow on the right image has a new color, angle, and position. This page is automatically refresed every 30 seconds.