Thursday, 20 June 2019

munker-white illusion

Though these spheres seem to come in three colourful varieties, David Novick created this optical illusion by exploiting a neurobiological factor known as lateral or antagonistic inhibition—the ability of a stimulated neuron to calm its neighbours so as not to overload the sensory system. Objectively, all the spheres are shaded identically and are a uniform brassy colour. The whole trick, impossible to unsee otherwise and probably not advisable to try, is broken down layer-by-layer with some philosophical musings and more examples at Bad Astronomy at the link above.