Many optical illusions illustrate the fallibility of the material senses. My favorite is the isometric line drawing of a cube, which at first appears to face one direction and then another. It shows most clearly that a person's mental standpoint, or subjective consciousness, can hide as well as reveal what is before him.
You and I might totally disagree in our description of the same drawing. It is interesting to note that if I persuade you to see the cube from my mental standpoint, the image you first saw will yield to it completely. Conversely, if I accept your mental point of view, the image I first saw will vanish.
Christian Science is instructing mankind how to challenge the evidence of the material senses. It does this on the basis of the oneness and allness of Spirit, God. It teaches that this challenge can be made successfully only as one spiritualizes, or purifies, his consciousness to the point where the mirage of matter can no longer deceive him. A consciousness conditioned by material education and reasoning alone cannot see the real creation of Spirit.
