Scott Weaver began working on his masterpiece Rolling Through the Bay 35 years ago.

This truly insane pile of toothpicks is a kinetic sculpture, which means balls roll down various pathways throughout piece.
The elaborate structure is comprised of multiple “tours” that move ping pong balls through famous San Francisco landmarks and neighborhoods.

Weaver estimates he’s spent 3,000 hours on his labor of love. Via his website Weaver estimates he’s spent over 3,000 hours on the project.