Unlike the Titchener Circles, the surrounding objects do not encircle the central objects in this image, and the central objects are contained in the same encirclement instead of being separated. The basic principles of the Ebbinghaus illusion, however, remain the same. The line at the bottom of the image appears smaller, because the tracks are farther away and thicker. The line near the middle of the image appears larger, because the tracks are closer together and the they appear thinner. I liked the way the image used Ebbinghaus illusion because, unlike the Titchener Circles, the image "flows" as one entity as opposed to the two central objects being separated.