A Jet Engine, Small Enough For A Shelf

It produces no thrust, burns no fuel and moves nothing. It is a model of a machine whose entire purpose is to make a very large object move, rendered at a size where it cannot move itself.

At forty-four dollars it is also the second most expensive thing here after a telephone that records wedding guests.

Because a turbofan is one of the more beautiful pieces of engineering in ordinary life and nobody ever gets to look at one. You board through a jet bridge, you sit down, and the closest you come is a cowling out of a window.

This is the same geometry with the cover off. The reason the front fan is enormous and the core is narrow, the reason the blades twist along their length — all of it is visible, and none of it is obvious from a photograph of an aeroplane.