Phidippus mystaceus has my vote as the most colorful of all the jumping spiders. It is this spider that offers the photographer the best chance of capturing images of the spider's retina, which is not fixed in place, like our own. The jumping spider's retina is moveable. Because the retina is the darkest part of the eye, you can sometimes look into the eye of a jumping spider and see it changing color as it moves to follow your actions. When it is darkest, you know the spider is looking straight at you, because then you are looking down into its retina.