This is how it works: The first image is in complementary colours (see video “Colours in the eye of the beholder”) and the second image is only grey-scale. Stare at the cross in the center and don’t move your eyes. The longer you fixate the cross, the more colours you shall see in the gray-scale image. After a couple of seconds, you will see the Shackleton building, where the School of Psychology is located, in its original colours. Move you eyes and you are back to gray-scale. You may download the animated image using right-click > save image.
