This past weekend, he created Tetris Alley. It's a crowd-sourced monument to the addictive architectural game, built in unconnected living rooms around the city out of wood and tape and spraypaint and whatever was available and then assembled on site (and in a few places along the way that looked like they wanted a Tetris L or J).
As of last night, the puzzle-pieced-together structure was still standing between the brick walls of Pioneer Square buildings between First Avenue and Occidental, just south of Jackson, becoming a quick nerd-tourist attraction. Hepworth made it along with "some more people who are passionate about stupid street art," and you can read all about the project (and watch videos) here. Or get down there—soon.