Artifical emphasis of Oppel-Kundt illusion (Oppel-Kundt 錯視の人工的強調) Humans, in general, tend to underestimate things that change less or slow. In visual perception, humans underestimate sizes of objects and areas with small fluctuations, so that humans recognize sights with shrinking blank areas and enlarging areas that wear detailed textures. This paper produces a simulation of such subjective visu