From the "Depth Spinner" to the "Cafe Wall Illusion," the Exploratorium has collected menagerie of thought-provoking and visually intriguing optical illusions. These particular illusions were picked out by staff members and represent the best of the best. First-time visitors simply must start with the "Fading Dot." This exercise in visual acuity will show users that the eye is constantly receiving new information and sending it to the brain. All told, there are twelve illusions, which are all both creative and quite a bit of fun. It's easy to see how these might be used to complement a range of classes, including physics, anatomy, media studies, and more.