Illusions relating to distinction and shade are generally a result of the way the retina's rods and cones system details by way of their receptive fields. An illusion is also a thing that appears to be or looks like another thing, but is both something else or isn't there https://illusionofkundunmuonline67764.mybjjblog.com/illusion-of-kundun-mu-online-options-48239873