point is that there is no such thing like a 'visual illusion'
u see or u don't, u perceive or u don't and what u do or not do is done with and by ur brain alone -- assuming there is one, a brain that is

perception as such is a creative process of the brain
that is to say, in the words of our famous physics put it : the is no such thing like colour out there
we perceive it coz the brain creates/computes it