Conceptually, its an illusion in the sense that theres "something" doin interpretation between the "real" things and our brain; in the zen koan of the tree that

Conceptually, its an illusion in the sense that theres "something" doin interpretation between the "real" things and our brain; in the zen koan of the tree that fells, it migth not be doing any sound because theres no brain processing the wave and telling someone that a tree falled.