Experiment results (Figure 2) (IMAGE) Toyohashi University of Technology (TUT) Caption People viewed the stimuli shown in Figure 1 on a display one at a time in a random order, and they estimated the depth of the object in the image. For all thicknesses, the results of the transparent object (blue line) where the only ones that were significantly lower than the results of the objects with other surface materials. Therefore, transparent objects were estimated to have less thickness than objects with other surface materials. Credit COPYRIGHT (C) TOYOHASHI UNIVERSITY OF TECHNOLOGY. ALL RIGHTS RESERVED. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.