Patterns, the latest game from Second Life creators, Linden Lab, is a sandbox-style game that focuses on building structures and exploring in an open world environment. While there is no specific plot, goal, or antagonist (other than physics) to speak of, Patterns does trigger a desire to explore.
Rod Humble makes video games. He knows a lot of people who wish they could, and he's made it his job to help them.
If someone sat me down and presented me with this gorgeous Technicolor dream of a world building-game called Patterns and then asked me what company was responsible for creating it, I could have guessed for hours and never gotten it right.