Interestingly enough, paying attention to the structure of a tropical cyclone helps us deduce how a tissue causes a tumor. A tropical cyclone is large atmospheric distortion, and consists of the body and the eye. The body and the eye have opposite air currents. Ascending air currents flow in the body; descending ones flow in the eye. In addition, when a tropical cyclone loses the eye, it abruptly loses the stability and then disappears. These phenomena reveal that a tropical cyclone maintains the structure on the basis of the balance of air currents between the eye and the body. In other words, a tropical cyclone is large atmospheric distortion, and cannot maintain the structure without causing the eye. Likewise, when a tissue causes strong tissue distortion, it will cause an eye to neutralize the strong tissue distortion. Just this eye can theoretically be considered a tumor.