Abstract: An illusionary device comprising an elongated body of predetermined outline having at least one portion thereof twisted about the longitudinal axis of the body. This twisted portion includes a surface which is modified and adapted so as to have an appearance of an axially moving, sinusoidal, optical wave pattern if said body is rotated. This includes a plurality of axially repeating features. Any one "feature" at a given axial location along the length of the twisted portion will appear to the viewer as varying periodically from a point, to a maximum for the feature, back to a point, and so on, as the body is rotated. Also, axially successive ones of the repeating features appear to the viewer as varying from a point to a maximum and back to a point over the length of each twist. The combined effect is such that the apparent axial movement of the wave pattern is enhanced when the body is rotated.