Effects of Shading, Texture, Movement, Noise and Scenery on the Hollow-Face Visual Illusion
The Hollow-Face Illusion is a well known and deeply studied optical illusion in which the observer perceives a concave face as convex. In this paper we created a projection screen with an embedded hollow-face. Using this screen, we experimented with a projected image on the hollow-face, that allowed us to vary certain conditions that may have an effect on the strength of the illusion. The conditions were; variations in shading, variations in noise, variations with scenery, variations in facial movement and variations in texture. We found out that texture and noise play a significant role on the strength of the illusion and finally, we discussed the practical applications of the illusion as an installation in public space.
Dunya Kirkali, "Effects of Shading, Texture, Movement, Noise and Scenery on the Hollow-Face Visual Illusion", Master's Thesis for the Media Technology programme, Leiden University (The Netherlands), 2009