As the saying goes that the heart's letter is read in the eyes. We see and find the mystery in nature with our eyes. For scientists, their eyes are the keys to the science door. From the discovery of cell to research of celestial object, scientists owe these important findings to eyes. How important they are! Although you trust them so much, however，what you see may be not the truth. Let us begin our adventure in this science toy and find out how our eyes trick us.