When we came to Facebook HQ to look at locations for murals, I noticed yellow stripes along the floor of this hallway. They suggested traffic--a busy thoroughfare with people going places. I thought it could be fun to show flying saucer traffic.
Bill and Craig were invaluable to get it done.
Part way into the project, each flying saucer got its own kind of exhaust--jacks, daisies, atoms, cherries, starbursts, and diamonds.