A bowling alley looks like the least engineered place you can spend an afternoon. Rented shoes, sticky floors, someone's name spelled wrong (or rudely) on the  display. Underneath the grime, neon, noise, and beer stains is four thousand years of arguing about pin dimensions, a materials-science arms race, and enough instrumentation to describe your delivery as a set of physical parameters.

Before 1952 the cost of running a lane scaled with the number of people bowling, because somebody had to sit in the pit and set the pins by hand. After the pinsetter, one more bowler cost almost nothing. Within a decade the pinboys were gone and America had eleven thousand bowling centres. 

Then the equipment got ahead of the game. Reactive resin arrives in the early nineties, scores climb across the entire competitive population, and the governing bodies answer with oil. 

The technology arms race in the bowling alley lives on.

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