Black and Blue Glare Illusions (IMAGE) Toyohashi University of Technology (TUT) Caption Glare illusion is an optical illusion that has a luminance gradient towards the center and is perceived as brighter by the gradient. 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.