Black Sand White Sand Grey Sand is a simple application, but it can have a great impact on how your web page looks. It is an application that will blur the page randomly, and it is made in such a way that you will not be able to see it when it happens. If you want to make sure that it does not do anything else that might not be useful to you, you have the option to hide it by pressing "s" key. This way, you will not see your web page being transformed into a blurry image.