This note describes a technique for obtaining a retinal after-image of a stationary object that appears to oscillate rapidly in a fixed path. The illusion involved, commonly referred to as induced movement (LM), is the observation of movement of an object in a direction opposite to that of an objectively moving background. The device for obtaining IM was described previously in greater derail (Vetter, 1965). A vertical display, i.e., a board on each side of which is a black dot, centered, and enclosed by a black verticallyoriented rectangle, is rotated on a record turntable. The rectangles are positioned with regard to each other such that, although the dots fall in identical positions on the two sides of the board one dot is near the top while the second is near the bottom of its respective rectangle. During rapid rotation (e.g., 100 rpm) a single dot is perceived as oscillating (IM) in a direction opposite that shown by the apparent (phi) movement of the rectangles. For present purposes the dots are replaced by two apertures 2 cm. in diameter. The spacing between the cwo sides is increased to 7 cm. so that a 25-w, 110-VAC bulb by being suspended from above may be exposed through the aperture of each side. A spot of light can then be seen within the rectangles although the bulb remains stationary during rotation. To allow for a maximum degree of IM under conditions thar also yield an afterimage, two further changes are necessary. First, only a minimum degree of room illumination is desirable. (Some light is needed to perceive the rectangles.) Secondly, since fixation of the bulb does not result in much IM a point at the top and center of the display is fixated during rotation. When the above conditions are met, the spot of light appears to oscillate vertically at a continuous rate, travelling a distance about equal in length to the inner vertical borders of the rectangles (16.5 cm.) when viewed at eye-level at a distance of 1.35 m. Following 4 min. of binocular fixation a recognizable after-image of the point is seen when the eyes are closed. It is about the size and shape of the after-imspc obtained when the apertures are fixated and the display is not rotating. This indicates [hat relatively slow, sweeping eye movements (e.g., due to involuntary follorving of the rectangles) are not occurring during the perception of IM. If overt, gross eye movements were, in part, responsible for the illusion, one would expect that streaking on rhe retina would exist and correspond to some extent to the subjective distance travelled by the object (6 to 8 of visual angle). Since such was not the case it is suggested [cf. previous observations (Vetter, 1965)] thar some other mechanism such as, e.g., implicit eye movements, is more likely involved in producing IM.