If there’s an App Store application that clearly benefits from the iPad, it’s Art Authority from Open Door Networks. The Apple tablet’s spacious screen adds an arresting dimension to this virtual art museum software. When you launch Art Authority, you enter the main gallery. It’s a very pleasant place. The screen rendering is so realistic that you’ll want to sit on the padded bench in the room and gaze on the paintings on the wall for awhile. Each painting represents a period of art.