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Amazingly, there isn't a lots of scientific research about how glasses can transform the way in which people see you -- instead of how they see what's facing them. But there's a high correlation with the Hollywood notion the fastest way to turn actors into giving the impression of scientists is always to make them wear a pair of not too flattering spectacles. Once you have settled on your theme, click on the Desktop Background option at the bottom of the Personalize window. Here you can see all the images within a particular theme and tick or untick them, removing unwanted ones from your cycle of images. You can also choose how the picture is shown on-screen, although leaving it in Fill mode will be fine unless you start using odd-shaped images. There is also a Shuffle tick box, allowing you to muddle up the order of the chosen images, so you won't know what is coming next.