thank youthank you, my lovely a. your brain is basically, when it looks at the image, your brain is adding stuff from its vast array of prior experiences of other squares, of boxes, upper rooms with angles and so on, and it is constructing the square that you saw. neurons in your visual cortex at the back of your brain constructed that image for you. they were changing the firing, they were changing their own firing to create lines that were not present so that you could see a shape that actually wasn't physically there. so you were in a manner of speaking hallucinating. not this scary kind of i better get to the hospital sort of hallucination, but the everyday my brain is built to work like this hallucination. your experience of the score revealed a couple of insights. first of all, your past experiences from direct encounters from photos, from movies and books and so on give meaning to your present sensations. additionally, the entire process of construction is invisible to you, the matter how hard you try you can'