Kokichi Sugihara “Rising Object Illusion”
Institution: MIMS, Meiji University
Author description: A lying object rises when it is reflected in a vertical mirror behind it. The object is typically a columnar body and the axis is horizontal directing toward the viewer. However, in the mirror the object rises with the axis directing vertically. The truth is that the object is a horizontally placed picture expanded by 1.41 (i.e., the square root of 2) in the direction of the axis, and this visual effect occurs when we see it in 45 degrees downward.