When the stimulus was the Hering illusion, Ss experienced—besides oscillation of the parallel lines—different kinds of rings around the intersection point of the rays. These rings were most frequently a number of circles and less frequently ellipses. The colours of the rings contrasted with the colours of the Hering illusion. The fact that straight lines may condition the experience of rings (circles or ellipses) is juxtaposed with the results of another experiment, in which I demonstrated that a circle as stimulus conditioned the experience of straight lines as radii in the circle.
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