RUNNING HEAD: Perspective and ellipses

Perspective and ellipses 2 Shapes on the surface of a perspective picture may be misperceived. Subjects picked a match for an ellipse depicting the circular top of a cylinder. The top was depicted as tilted from 50 to 850 around a horizontal axis, generating a series of ellipses on the picture surface. The matches were biased towards a circle over a wide range of midrange tilts, which suggests they were seen as in-between the shape on the surface and the shape they depicted. Perspective and ellipses 3 Ellipses on a picture’s surface When we are drawing, we often begin by outlining an area on the picture surface to match a shape in the scene. Of interest here is that the area on the surface will often change its appearance as soon as a perspective pattern is added to show the depth in the scene (Juricevic and Kennedy, 2006; Kennedy, Juricevic, Hammad and Rajani, in press). In the present study, we consider an elliptical area on the picture surface and ho