For those of you who have a bit of difficulty with these, just cross your eyes so that two similar points on the image become one. Some people have eyes that are slightly higher or lower than each other and you'll need to tilt your head just a tiny bit to line the two images up.
See how this image has an obvious repeating pattern? Just cross your eyes only enough to bring two like parts of the image together so they lock into place. The resulting, working image, will look like someone cut something out of the colors with scissors. Hold that cut out in your vision, don't move your head at all, and keep looking at it, you'll notice that some of these types will have extra layers of depth.
>>11098371>>11098372I dislike the ones like these that have actual images of the object in their makeup. I think that detracts.