Take five different looks, five different interactions, and grid them. Interface design is really this amorphous word. It keeps changing. And I like to break it down into three basic areas of focus in doing design, so we can keep it separate. They overlap a lot, but if you keep them separate you can choose what message you want to give each of these domains.
Information design is about the organization.
It's the architecture. It's the navigational space that your content lives in. Take a museum that's got pictures in it. Rip the pictures out. You have the walls and you have the space that people are moving through.