Fill in the gaps. David Lean famously declared that a feature film should have seven or eight major sequences. That’s a pretty good guideline for our play, our album, our State of the Union address. A video game should have seven or eight major movements; so should the newest high-tech gadget, or the latest fighter plane. Our new house should have seven or eight major spaces. A football game, a prize fight, a tennis match—if they’re going to be entertaining—should have seven or eight major swings of momentum.