is 38.40 KB, has a resolution of 500x500 pixels and was uploaded on October 13, 2018 @ 11:45 pm by user: mikaker. It is filed under the tags: troxler s fading, phenomenon, optics, atmosphere, atmosphere of earth. Click the blue button at the top to freely download: Light Circle Troxler's Fading Visual Perception Optics Optical Illusion Fraser Spiral png.