Two variations on illusions we have seen before. In the upper design, fix your eyes on the center dot and keep your gaze fixed, relaxing slightly. Astonishingly, the various clouds of color will gradually but very definitely fade out! For a simpler interactive version, and explanation, click here. Now scroll down to the next design. There is a very, very strong impression of a diagonal white latticework imposed on the background of black and slightly off-white. Of course, while the black lines are interrupted near their intersections, there is no latticework whatsoever in the design.