When playing with Legos, you can spend all day building anything you could dream up.

For Mark Roe, that's a day job — he's one of eight Master Builders in the entire world.

Over his 22-year career with Lego, he's designed and constructed 150 life-size sculptures. His most recent, of San Francisco Giants pitcher Madison Bumgarner, was unveiled July 30 at the the Giants' stadium, where it's now installed as a permanent fixture.

Roe gave Tech Insider an exclusive look at what it takes to build massive sculptures of people. Keep scrolling to step inside the Model Shop at Lego's US headquarters.