Design Conditionals

We can create design elements that appear only when certain conditions are met for example with a members only site we can check for a user being logged in and make a decision as to what we show them. This is useful for example if they have purchased information that isn't supposed to be available to the casual browsing individual like for example a tutorial site.

Let's say your site is selling artwork and you show low resolution images to the casual browser,  there could be download button displayed if the user (who has paid you for a login) gets the download button.